计算-(x²y+3xy-4)+3(x²y-xy+2)

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计算-(x²y+3xy-4)+3(x²y-xy+2)
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计算-(x²y+3xy-4)+3(x²y-xy+2)
计算-(x²y+3xy-4)+3(x²y-xy+2)

计算-(x²y+3xy-4)+3(x²y-xy+2)
-(x²y+3xy-4)+3(x²y-xy+2)
=(-x²y+3x²y)+(-3xy-3xy)+(4+6)
=2x²y-6xy+10