作业帮求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 11:34:06
求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差
求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差
求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差
-6x²y+2x³-xy²+7y³-(-7x²y+2x³-xy²-y³)
=-6x²y+2x³-xy²+7y³+7x²y-2x³+xy²+y³
=8y³+x²y
-6x²y+(2x³-xy²+7y³)-(-7x²y+2x³-xy²-y³)
=-6x²y+2x³-xy²+7y³+7x²y-2x³+xy²+y³
=8y³+x²y