(x+2y-3xy)-(-2x-y+xy),其中x+y=二分之一,xy=-二分之一用整体代入法求值.
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(x+2y-3xy)-(-2x-y+xy),其中x+y=二分之一,xy=-二分之一用整体代入法求值.
(x+2y-3xy)-(-2x-y+xy),其中x+y=二分之一,xy=-二分之一用整体代入法求值.
(x+2y-3xy)-(-2x-y+xy),其中x+y=二分之一,xy=-二分之一用整体代入法求值.
(x+2y-3xy)-(-2x-y+xy)
=x+2y-3xy+2x+y-xy
=3(X+Y)-4xy
x+y=二分之一,xy=-二分之一带入得:
原式=3*1/2-4*(-1/2)
=7/2
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