若x(3x-4)+2x(x+7)=5x(x-7)+90,则x等于( )
若x(3x-4)+2x(x+7)=5x(x-7)+90,则x等于( )
(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?
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
若m=4x²-6x+3,n=5x²-3x+4,则9x²-9x+7等于( )
(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几?
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
若(2-x):x=x:(1-x ),则x等于?
方程 3x(7-2x)+5x(2x-1)=4x(x-3)+56
当x=2,(x-x²-5)-(2x²+7x-3)等于几
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少