(80-x)÷(100+x)=7/11
(X+X)+(X-X)+(X*X)+(X/X)=100
2x+3x+4x+5x+x+6x+7x=100
X>7,x=100 x
(100-x):(80+x)=7:11 怎么解
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:5x(x+7)(x+4)=5x(x的平方+11x)
5x(x+7)(x+4)=5x(x^2+11X)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
1.25-x=2.8 2.36÷x+9=0 3.33x=79-x 4.5x-(11-7)=x+3 5.169÷(x+9)
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!)+.
解方程 5x=80 43-x=38 20-x=9 6.3÷x=7 x