1.(2x²y+3xy²)-(6x²y-3xy²)
问题描述：
1.(2x²y+3xy²)-(6x²y-3xy²)
2.(5mn-2m+3n)+(-7m-7mn)
3.(6a²-8a+11b³)-(11a²+2b³)
4.(2ab+3b²-5)-(3ab+3b²-8)
5.(4x²y+5xy-7x)-(5x²y+4xy+x)
6.-(10x³+2xy²+y³)+(10x³+3xy²-8y³)
7.(4mn²+3m²n-4m)-2(mn²+3/2m²n+1)
8.3(a³-a²b+1/2ab²)-1/2(6a³+4a²b+3ab²)
..急死了.
7.8题呢..晕..7.8题怎么直接答案呢
答
1.(2x²y+3xy²)-(6x²y-3xy²) =2x²y+3xy²-6x²y+3xy² =-4x²y+6xy² 2.(5mn-2m+3n)+(-7m-7mn) =5mn-2m+3n-7m-7mn =-2mn+5m+3n 3.(6a²-8a+11b³)-(11a²+...