11X+42-2X=105
11X+42-2X=105
11x+42-2x=100-9x-22
X+X×X=56 (X+2)-(X×X+7)=-45 X+a=105 X=?a=?
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42
x/2+x/6+x/12+x/20+x/30+x/42=1
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
解一元一次方程 x/2+x/6+x/12+x/20+x/30+x/42=6
5x(x+7)(x+4)=5x(x^2+11X)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
方程 0.6(x+4)+0.8=1.2x+0.58 11x+42-2x=100-9x-22
解方程x(2x-3)+3x+3x(x-2)=5x(x-4)+11