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1,x(x + 1)(x + 2)(x + 3)+ 12,x 2 + 3 xy + 2 y
来源:365bet网投官网 作者:365bet足球即时比分 发布时间:2019-03-01 阅读次数:80
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答:1
(X ^ 2 + 3 x + 2)+ 1 =(x ^ 2 + 3 x)+ 1 =(x 2 + 3 x)(X 2 + 3 x + 1)2 22 primitive =(x 2 + 3 x + 2 y 2)+(2 x + 4 y)=(x +)2 y)(x + y)+ 2(x + 2 y)=(x + 2 y)(x + y + 2)3。
(X + 1)(x + 3)]+(x + 1)(x + 1)(x +12 =(x 2 + 4 x)2 2(x 2 + 4 x) - 15 + 12 =(x 2 +(X ^ 2 + 4 x) - 2 - 2 x - 2 + 4 x - 3 = x 2 + 4 x - 3 x - 2 + 4 x + 1 4。
(X + y)2-2(x + y)-2xy(x + y)+ 4xy + x ^ 2y ^ 2-2xy + 1 =[(X + y-xy)+ 1 =(x + y-xy-1)+ 2×2 y 2 +^ 2 =[(x-1)(1-y)]^ 2 =(x-1)^ 2(y-1)^ 25。
那-5xy应该是-5xz吗?
6
(X ^ 2 + 12 + 7 x) - (x ^ 2 + 12 + 7 x) -(X ^ 2 + 12)^ 2 +(8 x + 7 x)(x 2 + 12)+ 56 x 2 - 42 x 2 =(x 2 + 12)2 + 15 x(X 2 + 12 + x)=(x 2 + 14 x + 12)(x 2 + x + 12))+ 14 x 2 =