5x²-3xy²-2(2x²y-xy²)怎么写?
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5x²-3xy²-2(2x²y-xy²)怎么写?
5x²-3xy²-2(2x²y-xy²)怎么写?
5x²-3xy²-2(2x²y-xy²)怎么写?
5x²-3xy²-2(2x²y-xy²)
=5x²-3xy²-4x²y+2xy²
=5x²-4x²y+(-3xy²+2xy²)
=5x²-4x²y-xy²
5x²-3xy²-2(2x²y-xy²)
=5x²-3xy²-4x²y+2xy²
=5x²-4x²y+(-3xy²+2xy²)
=5x²-4x²y-xy²
给分吧
5x²-5xy-4x²y