计算5xy²-{2x²-[3xy²-(xy²-2x²y)]÷(1/2xy)}

问题描述:

计算5xy²-{2x²-[3xy²-(xy²-2x²y)]÷(1/2xy)}

5xy²-{2x²-[3xy²-(xy²-2x²y)]÷(1/2xy)}
=5xy²-{2x²-[3xy²-xy²+2x²y]÷(1/2xy)}
=5xy²-{2x²-[2xy²+2x²y]÷(1/2xy)}
=5xy²-{2x²-4y-4x}
=5xy²-2x²+4y+4x确定不?绝对正确啊