4(x²+y)(x²-y)-(2x²-y)^2,其中x=2,y=-3化简并求值,一定要具体
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4(x²+y)(x²-y)-(2x²-y)^2,其中x=2,y=-3化简并求值,一定要具体
4(x²+y)(x²-y)-(2x²-y)^2,其中x=2,y=-3化简并求值,一定要具体
4(x²+y)(x²-y)-(2x²-y)^2,其中x=2,y=-3化简并求值,一定要具体
=4(x²x²-y²)-4x²x²+4x²y-y²
=4x²x²-4y²-4x²x²+4x²y-y²
=4x²y-5y²
=y(4x²-5y)
因为X=2,y= -3
所以原式:
= -3X(4X4+5X3)
=-93