12*5+4x=120
求文档:解方程:x-x/12-x/7-x/8-x/4-x/20-x/5=30+120+300+50
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
5x+9x=6x*2+12 x+9-x/3=4
x=x/6+x/12+x/7+5+x/2+4=?
x^3×x^5×x+(x^3)^12+4(x^6)^2=?
1/6x+1/12x+1/7x+5+1/2x+4=x
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
计算x-2/5x+120=3/4x
x+3分之2 x=60 x-5分之3x=120 4x+18x=132
x+2/3x=60 x-3/5x=120 4x+18x=1
5x+12=6x-4
x-x/5=2.4 (求未知数x) 12÷5%x=8 4x+x=12.5