4x(x-y)-(2x-3y)(2x-3y) x=1 y=-1
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4x(x-y)-(2x-3y)(2x-3y)x=1y=-14x(x-y)-(2x-3y)(2x-3y)x=1y=-14x(x-y)-(2x-3y)(2x-3y)x=1y=-14x(x-y)-(2x-3
4x(x-y)-(2x-3y)(2x-3y) x=1 y=-1
4x(x-y)-(2x-3y)(2x-3y) x=1 y=-1
4x(x-y)-(2x-3y)(2x-3y) x=1 y=-1
4x(x-y)-(2x-3y)(2x-3y)
=4x^2-4xy-4x^2-9y^2+12xy
=8xy-9y^2
=8*1*(-1)-9(-1)^2
=-8-9
=-17
4x(x-y)-(2x-3y)(2x-3y)其中 x=1 ，y=-1
解，得：
==4x(x-y)-(2x-3y)^2
==8-25
==-17
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