5x+85=200 18-2.5x=15 (x+2.4)×6=30
5x+85=200 18-2.5x=15 (x+2.4)×6=30
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
18%x+32%x=2 x+20%x=2.4 x+5%x=4.2 15%x+35%x=0.2
x+x=x+15
2x+3x+4x+5x+x+6x+7x=100
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
(X+X)+(X-X)+(X*X)+(X/X)=100
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
解方程3x=x+4,2.6x-8=2.4x,4x+12=10x+3 ,7x=12-×,2.5x=2x+4,5x+3=6x