整式的乘法 求解下面几道题,希望把过程写上 谢谢、 · 代表乘(x)
1(-2ab^2)·3a^2b-2ab-4b^323X^2(-3xy)^2-x^2(x^2y^2-2x)35x·(x^2-2x+4)+x^2(x-1)...
1 (-2ab^2)· 3a^2b - 2ab-4b^3
2 3X^2(-3xy)^2 - x^2(x^2y^2-2x)
3 5x·(x^2-2x+4)+x^2(x-1) 展开
2 3X^2(-3xy)^2 - x^2(x^2y^2-2x)
3 5x·(x^2-2x+4)+x^2(x-1) 展开
2个回答
展开全部
解1题
原式=(-2ab²)×3a²b-2ab-4b³
=-2×3×a×a²×b²×b-2ab-4b³
=-6a³b³-2ab-4b³
解2题
原式=3x²(-3xy)²-x²(x²y²-2x)
=3x²×(-3)²×x²×y²-x²×x²×y²+x²×2×x
=3×9×x²×x²×y²-x²×x²×y²+2×x²×x
=27x^4y²-x^4y²+2x³
=26x^4y²+2x³
解3题
原式=5x×(x²-2x+4)+x²(x-1)
=5x×x²-5x×2x+5x×4+x²×x-x²×1
=5×x×x²-5×2×x×x+5×4×x+x³-x²
=5x³-10x²+20x+x³-x²
=(5x³+x³)+(-10x²-x²)+20x
=6x³-11x²+20x
原式=(-2ab²)×3a²b-2ab-4b³
=-2×3×a×a²×b²×b-2ab-4b³
=-6a³b³-2ab-4b³
解2题
原式=3x²(-3xy)²-x²(x²y²-2x)
=3x²×(-3)²×x²×y²-x²×x²×y²+x²×2×x
=3×9×x²×x²×y²-x²×x²×y²+2×x²×x
=27x^4y²-x^4y²+2x³
=26x^4y²+2x³
解3题
原式=5x×(x²-2x+4)+x²(x-1)
=5x×x²-5x×2x+5x×4+x²×x-x²×1
=5×x×x²-5×2×x×x+5×4×x+x³-x²
=5x³-10x²+20x+x³-x²
=(5x³+x³)+(-10x²-x²)+20x
=6x³-11x²+20x
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