1、(-4·x·y²)·(3/4·x²·y-1/2x·y-5/6y³)
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1、(-4·x·y²)·(3/4·x²·y-1/2x·y-5/6y³)
2、21x²(x-1)-x(-x²+x-1)
2、21x²(x-1)-x(-x²+x-1)
1、(-4·x·y²)·(3/4·x²·y-1/2x·y-5/6y³)
=-3x³y³+2x²y³+10/3 xy的5次方
2、21x²(x-1)-x(-x²+x-1)
=21x³-21x²+x³-x²+x
=22x³-22x²+x
再问: 过程详细点行吗
再答: 一项一项乘进去就可以了, 1、(-4·x·y²)·(3/4·x²·y-1/2x·y-5/6y³) =(-4·x·y²)(3/4·x²·y) -(-4·x·y²)(1/2x·y) - (-4·x·y²)(5/6y³) =-3x³y³+2x²y³+10/3 xy的5次方
=-3x³y³+2x²y³+10/3 xy的5次方
2、21x²(x-1)-x(-x²+x-1)
=21x³-21x²+x³-x²+x
=22x³-22x²+x
再问: 过程详细点行吗
再答: 一项一项乘进去就可以了, 1、(-4·x·y²)·(3/4·x²·y-1/2x·y-5/6y³) =(-4·x·y²)(3/4·x²·y) -(-4·x·y²)(1/2x·y) - (-4·x·y²)(5/6y³) =-3x³y³+2x²y³+10/3 xy的5次方
1/2 x²y·( )=2x³y-x²y²
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