2.35：2.7=x:3.

2.35：2.7=x:3. 题是九个未知数的方程式.5X = 6X = 7X = 8X = 10X = 13X = 14X = 17X = 23X == (X + X + X + X + X + X + X + X + X + 30)≤280提示：题中 5 后面的X是未知数1.6 后面的X是未知数2.7后面的X是未知数3.依次类推.题中（X + X+13%X-28%X=3. X+0.8X=2.7 4x+x=3. 11.1x+x=3. 3.6x-x=3. x+15%x=3. 3道简单的分式方程,1.3/(1-x^) = 2/(1+2x+x) - 5/1-2x+x^2.5x/(x^+x-6) + (2x-5)/(x^-x-12) = (7x-10)/(x^-6x+8)3.(x+1)/(x+2) + (x+6)/(x+7) = (x+2)/(x+3) + (x+5)/(x+6) （X+X)+(X-X)+(X*X)+(X/X)=100 求x 的值.x +3.5x =9.9;4.25x -x =4.55;10x -2.7x =58.4;6.8x +3.2x =100 X(X的2次方-6X-9)-X(X的2次方-8X-15)+2X(3-X),其中X=1/3. 先化简,再求值 已知函数f(x)=2/x x≥2 (x-1)3.x 3.5x( )+2.7x( )+2.8x( )=18.9 ( )=什么 3.5x?+2.7x?+2.8x?=18.9 ?=多少 8x-2x=5.65x-2.7=2.8 4.7x减2.7x等于3. 函数f(x)与g(x)相等.f(x)=x-1,g(x)=x^2/x-11.f(x)=x-1,g(x)=x^2/x-1 2.f(x)=x^2 g(x)=(根号x)四次方3.f(x)=x^2 g(x)=3根号x六次方