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a2-2ab+b2-9x2+2x+1-y225-x2-2xy-y2 giai nhanh giup em,com on

Lấp La Lấp Lánh · Accepted Answer

1) $a^2-2ab+b^2-9=\left(a-b\right)^2-9=\left(a-b-3\right)\left(a-b+3\right)$2) $x^2+2x+1-y^2=\left(x+1\right)^2-y^2=\left(x+1-y\right)\left(x+1+y\right)$3) $25-x^2-2xy-y^2=25-\left(x+y\right)^2=\left(5-x-y\right)\left(5+x+y\right)$Câu trả lời: 1) $a^2-2ab+b^2-9=\left(a-b\right)^2-9=\left(a-b-3\right)\left(a-b+3\right)$2) $x^2+2x+1-y^2=\left(x+1\right)^2-y^2=\left(x+1-y\right)\left(x+1+y\right)$3) $25-x^2-2xy-y^2=25-\left(x+y\right)^2=\left(5-x-y\right)\left(5+x+y\right)$

Nguyễn Hoàng Minh · Answer

$1,=\left(a-b\right)^2-9=\left(a-b-3\right)\left(a-b+3\right)\
2,=\left(x+1\right)^2-y^2=\left(x-y+1\right)\left(x+y+1\right)\
3,=25-\left(x+y\right)^2=\left(5-x-y\right)\left(5+x+y\right)$Câu trả lời: $1,=\left(a-b\right)^2-9=\left(a-b-3\right)\left(a-b+3\right)\
2,=\left(x+1\right)^2-y^2=\left(x-y+1\right)\left(x+y+1\right)\
3,=25-\left(x+y\right)^2=\left(5-x-y\right)\left(5+x+y\right)$

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