2x的5次方×(-x)²-(-x²)的3次方×(-3x)
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2x的5次方×(-x)²-(-x²)的3次方×(-3x)
2x的5次方×(-x)²-(-x²)的3次方×(-3x)
2x的5次方×(-x)²-(-x²)的3次方×(-3x)
2x的5次方×(-x)²-(-x²)的3次方×(-3x)
=2x^5*x^2-(-x^6)*(-3x)
=2x^7+3x^7
=5x^7