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dianal21
@dianal21
August 2021
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1) (a+2b)-(a-b)-(a+b)^2
2) (y+x)^2-(y-x)^2
3) (a-2b)^2+(a+2b)*(a-2b) Решите срочно плеззз.....)))
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Lesben
1)(a+2b)-(a-b) - (a+b)ˇ2=a+2b-a+b -aˇ2-2ab-bˇ2=
=-aˇ2-bˇ2-2ab+b=-(aˇ2+2ab+bˇ2)+b=-(a+b)ˇ2+b
2)(y+x)ˇ2- (y-x)ˇ2=yˇ2+2yx+xˇ2-yˇ2+2yx-xˇ2=
= 4xy
3)(a-2b)ˇ2+(a+2b).(a-2b)=aˇ2-4ab+4bˇ2 +aˇ2-4bˇ2 =
= 2aˇ2-4ab=2a(a-2b)
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Answers & Comments
=-aˇ2-bˇ2-2ab+b=-(aˇ2+2ab+bˇ2)+b=-(a+b)ˇ2+b
2)(y+x)ˇ2- (y-x)ˇ2=yˇ2+2yx+xˇ2-yˇ2+2yx-xˇ2=
= 4xy
3)(a-2b)ˇ2+(a+2b).(a-2b)=aˇ2-4ab+4bˇ2 +aˇ2-4bˇ2 =
= 2aˇ2-4ab=2a(a-2b)