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。5(x-y)''3+10(y
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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