计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___
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计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___计算(1+3x)(3x-1)+9(1/3-x)(x+
计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___
计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___
计算(1+3x)(3x-1)+9(1/3-x)(x+1/3)的结果是___
(1+3x)(3x-1)+9(1/3-x)(x+1/3)
=9x^2-1+9*(1/9-x^2)
=9x^2-1+1-9x^2
=0
(1+3x)(3x-1)+9(1/3-x)(x+1/3)
=9x²-1+9(1/9-x²)
=9x²-1+1-9x²
=0
结果为0
(3x+1)(3x-1)=9x平方-1
9(1/3-x)(1/3+x)=9(1/9-x平方)=1-9x平方
两者加起来=0
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