解方程：3x（7-2x）+5x（2x-1）=4x（x-3）+56

解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7) 解方程：x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6 解分式方程：(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6) 解分式方程: (x-1)/(x-2)+(x-6)/(x-7)=(x-2)/(x-3)+(x-5)/(x-6) 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3 解方程 (x+2)/(x+1) - (x+4)/(x+3)=(x+6)/(x+5)-(x+8)/(x+7) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 解方程：(3-x)/(1-x)+(x^2-2)/(x^2-8x+7)=1+(x-5)/(x-7) x/(x-2)-(1-x ² )/(x ² -5x+6)=(2-x)/(x-3） 解方程,急 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 解方程：2（x-2)(x+3)-(2x-5)(x-1)=3x+7 解方程 2(x-2)(x+3)-(2x-5)(x-1)=3x+7 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） 解九宫格题目（X为未知数）9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 解方程:2(X-3)(X+5)=X平方+(X+2)(X-2)+(X+7) 解方程：x(3x-4)+2x(x+7)=5x(x-7)+90 解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2