计算(-5x+4y)(5x-4y)最好有步骤
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计算(-5x+4y)(5x-4y)最好有步骤计算(-5x+4y)(5x-4y)最好有步骤计算(-5x+4y)(5x-4y)最好有步骤(-5x+4y)(5x-4y)=[-(5x-4y)](5x-4y)=
计算(-5x+4y)(5x-4y)最好有步骤
计算(-5x+4y)(5x-4y)最好有步骤
计算(-5x+4y)(5x-4y)最好有步骤
(-5x+4y)(5x-4y)
=[-(5x-4y)](5x-4y)
=-(5x-4y)^2
=-(25x^2-40xy+16y^2)
=-25x^2+40xy-16y^2
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