①-1/3(9x^2-3)+6(2/3x^2+1)②x^2y-(6xy+3x^2y-xy^2)+(5xy+2x^2y)过

独爱美人鱼2022-10-04 11:39:541条回答

①-1/3(9x^2-3)+6(2/3x^2+1)②x^2y-(6xy+3x^2y-xy^2)+(5xy+2x^2y)过程

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anton1717 共回答了16个问题 | 采纳率93.8%
①-1/3(9x²-3)+6(2/3x²+1)
=-3x²+1+4x²+6
=x²+7
②x²y-(6xy+3x²y-xy²)+(5xy+2x²y)
=x²y-6xy-3x²y+xy²+5xy+2x²y
=xy²-x²y
1年前

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