(8x-30-60)\(7x+60)=7\20
30X-2X=84 5.8X-X=60 6.6X-5X=8 4X-X=24 1.5X-X=1
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
60%x+91=103 x-20%x=4.8 13%x-19=7
求几道解方程数学题60%x+25=40 x+30%x=52 19-120%x=7 x-10%x=18 (1-25%)x=
求文档:解方程:x-x/12-x/7-x/8-x/4-x/20-x/5=30+120+300+50
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
x/40+x/60+[20-(x/40+x/60)*8]÷40=x/40+(20-x)/8怎么解
x-60%x-25%x=25%x-30
x-3(20-x)=3x-7(9-x)
X-5+8*X=7*X-2*X-1