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Wiskunde

Graad 8

Getallestelsel

(natuurlike- en telgetalle)

Module 6

Deling in algebra

KLASOPDRAG 1

  • Kom ontdek stap vir stap meer omtrent DELING in ALGEBRA
  • Skryf die volgende breuk in sy eenvoudigste vorm 45 36 size 12{ { {"45"} over {"36"} } } {} = ........................
  • Net soos wat jy gewone breuke in eenvoudigste vorm kan skryf, kan jy ook algebraïese breuke in eenvoudigste vorm skryf.

Hoe sal die volgende in sy eenvoudigste vorm lyk? 6 a 2 b 3 ab size 12{ { {6 size 11{a rSup { size 8{2} } b}} over { size 12{3 bold "ab"} } } } {} = .........................

Ja dit lyk eintlik so: 6 × a × a × b 3 × a × b size 12{ { {6 times size 11{a} times size 11{a} times size 11{b}} over {3 times ` size 11{a}` times ` size 11{b}} } } {} = 2 × a × 1 × 1 1 × 1 × 1 size 12{ { {2 times size 11{a} times 1 times 1} over {1 times `1` times `1} } } {}

(Nou kan jy al die terme wat bo en onder dieselfde is kanselleer)(Wat bly nou bo en onder oor? Skryf dan net jou antwoord neer)

  • Daar is ‘n kortpad vir die terme met eksponente: m 5 m 7 = size 12{ { { size 11{m rSup { size 8{5} } }} over { size 12{m rSup { size 8{7} } } } } size 12{`={}}} {} .........................

Kan jy die kortpad sien? Ja, 7 - 5 = 2. Dus bly m² onder die lyn oor.

Antwoord : 1 m 2 size 12{ { {1} over { size 11{m rSup { size 8{2} } }} } } {}

1. Vereenvoudig nou die volgende:

1.1 18 m 5 9m 2 size 12{ { {"18" size 11{m rSup { size 8{5} } }} over { size 12{9m rSup { size 8{2} } } } } } {} ..................................................

1.2 15 p 4 y 7 3p 7 y 3 size 12{ { {"15" size 11{p rSup { size 8{4} } y rSup { size 8{7} } }} over { size 12{3p rSup { size 8{7} } y rSup { size 8{3} } } } } } {} ..................................................

1.3 ( 4 m 2 ) 2 2 m 6 size 12{ { { \( 4 size 11{m rSup { size 8{2} } } size 12{ \) rSup { size 8{2} } }} over {2 size 11{m rSup { size 8{6} } }} } } {} ..................................................

1.4 4 ( 2 m 2 ) 5 2 ( m 2 ) 2 size 12{ { {4 \( 2 size 11{m rSup { size 8{2} } } size 12{ \) rSup { size 8{5} } }} over {2 \( size 11{m rSup { size 8{2} } } size 12{ \) rSup { size 8{2} } }} } } {} ..................................................

1.5 8 a 2 ( a 2 ) 2 8 a 2 size 12{ { {8 size 11{a rSup { size 8{2} } } size 12{ \( }a rSup { size 8{2} } size 12{ \) rSup { size 8{2} } }} over {8 size 11{a rSup { size 8{2} } }} } } {} ..................................................

1.6 25 a 2 b 3 c 4 . 4 ab 3 c 2 15 a 3 b 4 c 5 size 12{ { {"25" size 11{a rSup { size 8{2} } b rSup { size 8{3} } c rSup { size 8{4} } } size 12{ "." 4} bold "ab" rSup { size 8{3} } c rSup { size 8{2} } } over { size 12{"15"a rSup { size 8{3} } b rSup { size 8{4} } c rSup { size 8{5} } } } } } {} ..................................................

2. Onthou: 1 3 b ( 9 a ) size 12{ { {1} over {3} } size 11{b} \( 9 size 11{a} \) } {} = 1 × b 3 × 9 a 1 size 12{ { {1 times size 11{b}} over {3} } times { {9 size 11{a}} over {1} } } {} = b × 9 a 3 = 9 ab 3 size 12{ { { size 11{b} times 9 size 11{a}} over {3} } `=` { {9 size 11{ bold "ab"}} over {3} } } {} = 3 ab

Dus: 1 3 size 12{ { {1} over {3} } } {} beteken: x 1 ÷ 3

Vereenvoudig die volgende: 1 / 3 ( 4 a - 6 b )

2.1 Skryf elk van die volgende in ‘n vereenvoudigde vorm.

2.1.1 1 5 size 12{ { {1} over {5} } } {} x a ..................................................

2.1.2 1 5 size 12{ { {1} over {5} } } {} (2 a ² - 15) ..................................................

2.1.3 (2 a - 8 b + 12 c ) ÷ 2 ..................................................

2.1.4 6 a 2 b 2 c 3 - 15 a 4 b 6 c 7 + 27 b 9 c 10 3a 2 b 4 c 3 size 12{ { {6 size 11{a rSup { size 8{2} } b rSup { size 8{2} } c rSup { size 8{3} } } size 12{" - 15"}a rSup { size 8{4} } b rSup { size 8{6} } c rSup { size 8{7} } size 12{" "+" 27"}b rSup { size 8{9} } c rSup { size 8{"10"} } } over { size 12{3a rSup { size 8{2} } b rSup { size 8{4} } c rSup { size 8{3} } } } } } {}

2.1.5 7 m 2 pq 9 - 49 m 6 n 7 - 35 p 6 q 12 7 mn 3 q 4 size 12{ { {7 size 11{m rSup { size 8{2} } bold "pq" rSup { size 8{9} } } size 12{" - 49"}m rSup { size 8{6} } n rSup { size 8{7} } size 12{" - 35"}p rSup { size 8{6} } q rSup { size 8{"12"} } } over { size 12{ - 7 bold "mn" rSup { size 8{3} } q rSup { size 8{4} } } } } } {}

HUISWERKOPDRAG 1

1. Vereenvoudig:

1.1 - 56 p 7 q 7 -8 mn 3 q 4 size 12{ { {"- 56" size 11{p rSup { size 8{7} } q rSup { size 8{7} } }} over { size 12{"-8" bold "mn" rSup { size 8{3} } q rSup { size 8{4} } } } } } {}

1.2 3 a 2 bc 4 - 36 a 4 b 7 + 24 a 3 b 2 -3 ab 2 c 2 size 12{ { {3 size 11{a rSup { size 8{2} } bold "bc" rSup { size 8{4} } } size 12{" - 36"}a rSup { size 8{4} } b rSup { size 8{7} } size 12{" "+" 24"}a rSup { size 8{3} } b rSup { size 8{2} } } over { size 12{"-3" bold "ab" rSup { size 8{2} } c rSup { size 8{2} } } } } } {}

1.3 ½ (5 a ² - 25 b )

1.4 ( a 2 b 2 ) 3 . ( ab 2 ) 4 a 2 b 3 size 12{ { { \( size 11{a rSup { size 8{2} } b rSup { size 8{2} } } size 12{ \) rSup { size 8{3} } "." \( } size 11{ bold "ab" rSup { size 8{2} } } size 12{ \) rSup { size 8{4} } }} over { size 11{a rSup { size 8{2} } b rSup { size 8{3} } }} } } {}

1.5 3 ( 4 kp 4 ) 2 2 k 3 p 2 size 12{ { {3 \( 4 size 11{ bold "kp" rSup { size 8{4} } } size 12{ \) rSup { size 8{2} } }} over {2 size 11{k rSup { size 8{3} } p rSup { size 8{2} } }} } } {}

2. As P = 3 ab ² + 6 a ² en Q = 2 ab , bereken:

2.1 2 P - 3 Q

2.2 P Q size 12{ { { size 11{P}} over { size 11{Q}} } } {}

2.3 P + Q 2 Q size 12{ { { size 11{P}`+` size 11{Q}} over {2 size 11{Q}} } } {}

3. As 5 a 3 b ² boeke (-5 ab + 15 a 4 b 7 ) rand kos, bereken wat sal een boek kos?

Assessering van myself: deur myself: Assessering deur opvoeder:
Ek kan… 1 2 3 4 Kritieke Uitkomste 1 2 3 4
breuke in hul eenvoudigste vorm uitdruk; (Lu 2.2; 1.6.2) Kritiese en skeppende denke
algebraïse breuke in hul eenvoudigste vorm uitdruk; (Lu 2.2; 1.6.2; 2.8.3; 2.8.4; 2.8.5; 2.8.6) Deelname
terme met eksponente vermenigvuldig en deel. (Lu 2.2; 1.6.2; 1.6.3) Organisering en bestuur
Prosessering van inligting
Kommunikasie
Probleemoplossing
Selfstandigheid

goed gedeeltelik nie goed nie

Kommentaar deur die leerder: My plan van aksie: My punte:
Ek is besonder tevrede met die standaard van my werk. < Datum :
Ek is tevrede met die vordering van my werk. Uit:
Ek het hard gewerk, maar is nie tevrede met my prestasie nie. Leerder :
Ek het nie my beste gelewer nie. >
Kommentaar deur ouers: Kommentaar deur opvoeder:
Handtekening: Datum : Handtekening: Datum :

Tutoriaal: (Algebra)

Totaal: 70

Vraag 1

A. Sê of die volgende stellings WAAR of ONWAAR is en verbeter die foutiewe stellings.

1. Die grondtal van 2 x size 12{x} {} 3 is 2 x size 12{x} {} .

2. Die aantal terme in die uitdrukking is DRIE:3(5 a + 2) + 5 b - 6

3. -10 ½<-10,499

4. -2² = -4

5. Die eerste priemgetal is 1.

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Source:  OpenStax, Wiskunde graad 8. OpenStax CNX. Sep 11, 2009 Download for free at http://cnx.org/content/col11033/1.1
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