(x+2y)(x-2y)-(2x-y)的平方-5y(五分之二x-y) 其中x=二分之一,y=-四分之一
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(x+2y)(x-2y)-(2x-y)的平方-5y(五分之二x-y) 其中x=二分之一,y=-四分之一
(x+2y)(x-2y)-(2x-y)的平方-5y(五分之二x-y) 其中x=二分之一,y=-四分之一
(x+2y)(x-2y)-(2x-y)的平方-5y(五分之二x-y) 其中x=二分之一,y=-四分之一
(x+2y)(x-2y)-(2x-y)²-5y(5分之2x-y)
=(x²-4y²)-(4x²-4xy+y²)-(2xy-5y²)
=x²-4y²-4x²+4xy-y²-2xy+5y²
=-3x²+2xy
=-3×(2分之1)²+2×2分之1×(-4分之1)
=-3×4分之1-2×4分之1×4分之1
=-4分之3-4分之1
=-1
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