有例子x²+6x-7|| ||x × 7=7x\ =6xx × -1=-x/(x-1)(
有例子x²+6x-7|| ||x × 7=7x\ =6xx × -1=-x/(x-1)(
4x-2=3x+1 -x+3=10 x-7=11-x x=四分之一x+6
已知3x-x=1,求6x+7x-5x+2000的值.
解方程:xx−2+ x−9x−7= x+1x−1+ x−8x−6
4x²-4x+1=x²+6x+9
解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20
解决数独问题x 1 x 7 x x x 3 xx x x x 4 x 2 x x9 x 3 6 x 8 7 x 58 x
7/x²+x+3/x²-x-6/x²-1 解分式方程
已知x-3x+1=0,计算2x-3x-7x+2009
150.5x -4x +0.5x =7
x+2/x+3-x+1/x+2=x+8/x+9-x+7/x+8
x2+﹙1/6﹚x-1/3=0②x2-2x=3③x2-4x-2=0④-2x²-x+7=0⑤3x²-x