(x-1)÷2+(x-1)÷6+(x-1)÷12+···+(x-1)÷90=-3,求x的值

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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} [(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x 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 计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1. (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 两道初二数学计算题(1)x+6/x^2+2x+1-x+4/x^2+x=0(2)x+3/x÷x^2+3x/x-3·1/3-x (1+x)(x-1/x²+x-1-x/x的3次方-x)3x-6/x²-4÷(x+2/x²+4x+4) -2 (x-1/x²+6x+9)÷(x²-1/x+3)=(x+1/2) 1.计算①(x-1-x+1分之8)×x+3分之x+1;②x+3y分之x-y÷x²+6xy+9y²分之x²-y²-x+y分之2y;③(x-x+1分之2x)÷x²-1分之x²-2x+1④(x²-2x分之x+2-x²-4x+4分之x-1)÷x³-2x²分之x-4 x^2-1/x^2+4x+4÷(x+1)×x^2+3x+2/x-1计算 先化简,再求值(2x-6)/(4-4x+x^2)÷ (x+3)× (x^2+x-6)/(3-x),其中x=-1/2 若x=1/x,则(x²2-6x+9)/(x-3)÷(x+3)/(x²+6x+9)的值是 计算(x-4x+4/x-4减x/x+2)÷x-1/x+2 *-----------------------------------------------*| 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 || x^7÷x^2×x^3-2(x^2)^3×x^2+(x^2)^6÷(-x)^4+[(x^3÷x^2÷x)^0+1]^2 其中x≠0 几道数学题:x-x^2分之x^2-1×1-y分之xy-x,(xy-x^2)÷xy分之x-y,x^2+x分之x-3÷(x^2-6x+9)谢谢! 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平方+7x+10)/(x平方+6x+5) × (x三次方+1)/(x平方+4x+4) ÷ (x平方-x+1)/x-2 其中,x=4.