化简3x^2-[7x-(4x-3)-2x^2再加一题-3(1-1/6x)
问题描述:
化简3x^2-[7x-(4x-3)-2x^2
再加一题-3(1-1/6x)
答
3x^2-[7x-(4x-3)-2x^2]
=3x^2-[7x-4x+3-2x^2]
=3x^2-3x-3+2x^2
=5x^2-3x-3
-3(1-1/6x)=-3+1/2x