5(x-y)'3+10(y-x)'2;16a'4-72a'2b'2+81b'4;4a'2b'2-(a'2+b'2)'2;18b(a-b)'2-12(a-b)'2牛头不对马嘴。
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![5(x-y)'3+10(y-x)'2;16a'4-72a'2b'2+81b'4;4a'2b'2-(a'2+b'2)'2;18b(a-b)'2-12(a-b)'2牛头不对马嘴。](/uploads/image/z/3897090-18-0.jpg?t=5%EF%BC%88x-y%29%273%2B10%28y-x%29%272%3B16a%274-72a%272b%272%2B81b%274%3B4a%272b%272-%28a%272%2Bb%272%29%272%3B18b%28a-b%29%272-12%28a-b%29%272%E7%89%9B%E5%A4%B4%E4%B8%8D%E5%AF%B9%E9%A9%AC%E5%98%B4%E3%80%82)
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5(x-y)'3+10(y-x)'2;16a'4-72a'2b'2+81b'4;4a'2b'2-(a'2+b'2)'2;18b(a-b)'2-12(a-b)'2牛头不对马嘴。
5(x-y)'3+10(y-x)'2;
16a'4-72a'2b'2+81b'4;
4a'2b'2-(a'2+b'2)'2;
18b(a-b)'2-12(a-b)'2
牛头不对马嘴。
5(x-y)'3+10(y-x)'2;16a'4-72a'2b'2+81b'4;4a'2b'2-(a'2+b'2)'2;18b(a-b)'2-12(a-b)'2牛头不对马嘴。
1.= 5(x-y)'3+10(x-y)'2=5(x-y)'2(x-y-2)
2.=(4a'2)'2-2*(4a'2)*(9b'2)+(9b'2)'2=(4a'2-9b'2)'2=(4a-3b)'2(4a+3b)'2
3.=-(a'2-b'2)'2;
4.直接提公因式
长方体体积为abc,现在要使锻造后体积不变,则圆柱体体积=长方体体积,所以计算方法如下:
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