7-30%X=15
(25/X)X(30/X)= 15/X怎么算
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=90
计算:(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9
7-30%X=15
x+x=x+15
x-30%x=7,(1+35%)x=270%,15-10%x=1.解方程
几道未知数的题!5X*3=7X+96 4X*3+6=8X+30 X-15+X+5+0.5X+3X=265
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
x-(30%x+30%x+15)=25
解比例.x:30=15:x x=?
(25%X-30)+110=15%X+X