求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差
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求整式-6x²y加上2x³-xy²+7y³的和与-7x²y+2x³-xy²-y³的差求整式-6x²y加上2x&
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