(X+7)(X+5)-(X+1)(X+5)=42
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
3/x-1=4/x 6/x+1=x+5/x(x+1)
(X+7)(X+5)-(X+1)(X+5)=42
(x+7)(x+5)-(x+1)(x+5)=42解方程
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
方程 3x(7-2x)+5x(2x-1)=4x(x-3)+56
(x-1)/x -(1-x)/(x+1)=(5x-5)/(2x+2) x等于多少
解方程(x+7)(x+5)-(x-1)(x+1)(x+5)=42
计算:1/(x^2-7x+10)+1/(x^2-x-2)+1/(x^2+5x+4)+1/(x^2+11x+28)=( )
求和:Sn=1+3x+5x*x+7x*x*x+……+(2n-1)x^n-1 (x不为0和1)
x+1分之x+2减去x+3分之x+4=x+5分之x+6减去X+7分之x+8 (解方程)