7x-x+2*3=29.4 (28.8+5.5x+3.2)/2=71
7x-x+2*3=29.4 (28.8+5.5x+3.2)/2=71
5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2)/2=71 方程解
解方程:5x=25×4-15x和7x-x+2×3=29.4和(28.8+5.5x+3.2)÷2=71
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x+3x+4x+5x+x+6x+7x=100
初一数学x*x+2x+5的值为7,请求3x*x+6x+3的值.因为x*x+2x2x+3=3x(x*x+2x)+2x+2x
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
2x²+7x+1=0 x(x-1)=3x+7
f(x)=x²+3x|x-2|
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1