1+x÷5

*-----------------------------------------------*| 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 (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 x^2-10x+25/x-1÷x^2-1/5-x 16-x^2/x^2-2x-3÷1^2-5x+4/x-3 (-x^2n-2)*(-x)^5÷[x^n+1*x^n*(-x)]=? (-x^2n-2)(-x)^5÷[x^n+1·x^n`(-x)] (5x^2-19x^3+17x+6x^4-4)÷(1-5x+3x^2) 先化简再求值：[(x-2/x+2)+(4x/x^2-4)]÷(1/x^2-4),其中x=-5 (x^5-6x³+7x²-7x+3)÷(x³-2x+1) (x^5-6x³+7x²-7x+3)÷(x³-2x+1) 急需(x方+xy/x)的负1次方÷[(x-y/x)×(x/y-x)]的负5次方 3-x/2x-4÷（x+2 - 5/x-2)(1/x+1 + 1/x-1)÷ x/x+11/x+1 - x+3/x²-1 · x²-2x+1/x²+4x+3（1/x - 1/2)÷（1- x²+4/4x ）