计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做?

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计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做?
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计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做?
计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做?

计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做?
-6x^2+6

6x^2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)
=6x^2一(6x^2-7x+2)十(x^2-4)一(x^2十7x)
=7x-2十(x^2-4)一(x^2十7x)
=-6

6x2我的理解是6x^2
原式=6x^2-(6x^2-7x+2)+x^2-4-x^2-7x=-6