解方程5（x-1）平方-2（x+3）平方=3（x+2）平方-7（6x-1）要过程

显示全部楼层 · 2009-4-12 10:37:01

5(x-1)^2-2(x+3)^2=3(x+2)^2-7(6x-1)5(x^2-2x+1)-2(x^2+6x+9)=3(x^2+4x+4)-7(6x-1)(5x^2-10x+5)-(2x^2+12x+18)=(3x^2+12x+12)-(42x-7)5x^2-10x+5-2x^2-12x-18=3x^2+12x+12-42x+73x^2-22x-13=3x^2-30x+193x^2-22x-13-3x^2+30x-19=0-22x-13+30x-19=08x-32=0x=4...

千问 · 2009-4-12 10:37:01

展开5（x^2-2x+1）-2(x^2+6x+9)=3(x^2+4x+4)-42x+75x^2-10x+5-2x^2-12x-18=3x^2+12x+12-42x+73x^2 -22x-13=3x^2 -30x+198x=32x=4...