2400>6口x口1>1800 798÷86口x口1>1800 798÷82口4÷3>80

2400>6口x口1>1800 798÷86口x口1>1800 798÷82口4÷3>80 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 (2x-6)/(x^2-9)+(x^2+2x+1)/(x^2+x-6)÷(x+1)/(x-2) x^2-x/x+1÷x/x+1 ；x^2+6x+9/x^2-9÷x+2/x-3；2/a÷4/a *-----------------------------------------------*| 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 || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 数学解方程[(x+1)(x-1)-(x-1)(x平方+x+1)]÷x平方=三分之一x+6 x+6分之x+1÷x²-36分之x²+x-x分之x-6,其结果是? (1-x/3-x)^2÷(x^2-6x+9/9-x^2)*1/x^2-2x+1 (x^-3x+2/x^-5x+6)^2÷(x-1/x^2-2x-3)^2 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} 化简：〔（x^2+18x+72)÷（x+12)-(x^2+5x-6)÷(x-1)〕·(x^3-2x^2-x+1) x-1/x÷(x-1/x) 计算：(1)/(x-3)÷(x+2)/(x^2-9)-(1)/(x^2+5x+6) 化简：x^2-5x+6/x^2-1÷x-3/x+1 化简：【x-3/x+3 + 6x/x^2-9】÷ 1/x^2-9 (x-3/x+3+6x/x²-9）÷1/x²-9化简就行 1.x/x-y * y^2/x+y -x^4y/x^4-y^4÷ x^2/x^2+y^2 2.(x^2-4/x^2-x-6+ x+2/x-3)÷ x+1/x-33.(x+1-1/1-x)÷（x- x^2/x-1)4.x-1/x^2+3x+2/6/2+x-x^2-10-x/4-x^21111111111111111111111111111111