5xy²-{2x²y-[3xy²-(4xy²-2xy²)]} 其中x=2,y=-1
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5xy²-{2x²y-[3xy²-(4xy²-2xy²)]} 其中x=2,y=-1
5xy²-{2x²y-[3xy²-(4xy²-2xy²)]} 其中x=2,y=-1
5xy²-{2x²y-[3xy²-(4xy²-2xy²)]} 其中x=2,y=-1
5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}
=5xy²-{2x²y-[3xy²-4xy²+2xy²]}
=5xy²-{2x²y-[ -xy²+2xy²]}
=5xy²-{2x²y+3xy²-2xy²}
=5xy²-{5x²y-2xy²}
=5xy²-5x²y+2xy²
=7xy²-5x²y
=xy(7y-5x)
=2×(-1)×【7×(-1)-5×2】
= -2(-7-5)
=(-2)×(-12)
=24