(x+2y)²-(x-y)²和16(a-b)²-25(a+b)²因式分解
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(x+2y)²-(x-y)²和16(a-b)²-25(a+b)²因式分解
(x+2y)²-(x-y)²和16(a-b)²-25(a+b)²因式分解
(x+2y)²-(x-y)²和16(a-b)²-25(a+b)²因式分解
16(a-b)^2-25(a+b)^2
=[4(a-b)+5(a+b)][4(a-b)-5(a+b)]
=(9a+b)(-a-9b)
=-(9a+b)(a+9b)
(x+2y)²-(x-y)²
=(x+2y+x-y)(x+2y-x+y)
=3y(2x+y)
16(a-b)²-25(a+b)²
=【4(a-b)+5(a+b)】【(4(a-b)-5(a+b)】
=(9a+b)(-a-9b)
= -(9a+b)(a+9b)