7/12x+25%x=9/20
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少
x-3(20-x)=3x-7(9-x)
计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12
1.解方程 (1+25%)X=5 24%X-7=7.24 48*20%+X=12 X-10%X=9
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
解方程5X+35=140-2X 9X-27=70+4X 12+7X=2X+32 250/X+25=75 23X-72X+
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
20%x+[25*(20%x)]+12=50%x+2
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9