1/2(3xy+2x²）-3(x²-1/2xy)化简 并求值
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1/2(3xy+2x²）-3(x²-1/2xy)化简并求值1/2(3xy+2x²）-3(x²-1/2xy)化简并求值1/2(3xy+2x²）-3(x&
1/2(3xy+2x²）-3(x²-1/2xy)化简 并求值
1/2(3xy+2x²）-3(x²-1/2xy)化简 并求值
1/2(3xy+2x²）-3(x²-1/2xy)化简 并求值
1/2(3xy+2x²）-3(x²-1/2xy)
=3/2xy+x²-3x²+3/2xy
=3xy-2x²