4(x-y)^2-25(x+y)^2
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发布时间:2024-10-14 00:38
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热心网友
时间:2024-10-26 07:58
4(x-y)^2-25(x+y)^2
平方差
=(2x-2y+5x+5y)(2x-2y-5x-5y)
=(7x+3y)(-3x-7y)
=-(7x+3y)(3x+7y)
热心网友
时间:2024-10-26 07:57
4(x-y)^2-25(x+y)^2
=4(x²-2xy+y²)-25(x²+2xy+y²)
=-21x²-58xy-21y²
=-(3x+7y)(7x+3y)
热心网友
时间:2024-10-26 07:54
4(x-y)^2-25(x+y)^2
=[2(x-y)]^2 - [5(x+y)]^2
=[2(x-y) +5(x+y)]* [2(x-y) -5(x+y)]
=(7x +3y)* ((-3x - 7y)
=- (7x+3y)*(3x +7y)