化简-7x-{3x-2[x-a(x-1)]-3(2x-2)}

化简-7x-{3x-2[x-a(x-1)]-3(2x-2)}
化简-7x-{3x-2[x-a(x-1)]-3(2x-2)}

化简-7x-{3x-2[x-a(x-1)]-3(2x-2)}
楼主计算时注意依次化开括号就行了
还有就是自己要细心
-7x-{3x-2[x-a(x-1)]-3(2x-2)}
=-7x-{3x-2[x-ax+a]-3(2x-2)}
=-7x-{3x-2x+2ax-2a-3(2x-2)}
=-7x-{3x-2x+2ax-2a-6x+6}
=-7x-3x+2x-2ax+2a-14-2a+6x-6
=(-2-2a)x+2(a-3)
楼主要是还有其他上面问题,也欢迎找我讨论

原始=-7X-3X+2[X-a(X-1)]+3(2X-2)
=-7X-3X+2X-2a(X-1)+6X-6
=-8X-2aX+2a+6X-6
=-2X-2aX+2a-6
=-(2+2a)X+2a-6
=-2(1+a)X+2(a-3)

-7x-{3x-2[x-a(x-1)]-3(2x-2)}
=-7x-{3x-2[x-ax+a)]-6x+6}
=-7x-{3x-2x+2ax-2a-6x+6}
=-7x-3x+2x-2ax+2a+6x-6
= -2x-2ax+2a-6.

-7x-{3x-2[x-a(x-1)]-3(2x-2)}=-7x-[3x-2(x-ax+a)-6x+6]=-7x-(3x-2x+2ax-2a-6x+6)=-7x-(2ax-5x-2a+6)=-7x-2ax+5x+2a-6=-2x-2ax+2a-6