3x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^8

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3x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^83x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^83x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^8x的几次

3x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^8
3x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^8

3x^3乘以x^9加x^2乘以x^10减2x乘以x^3乘以x^8
x的几次方相乘就等于x的幂数相加
x^3乘以x^9就等于x^12
然后原式等于
3x^12+x^12-2x^12=2x^12