求x/2+x/8+x/12+x/20+x/30+x/42大于6的解集

x/2+x/6+x/12+x/20+x/30+x/42+x/56=7/8 其中x未知数,求x,要求简便. 通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20 求x/2+x/8+x/12+x/20+x/30+x/42大于6的解集 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X x/2+x/8+x/12+x/20=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 || f[x -x/8-x*x]=√2 10求x^2 20x^10 x 分解因式：x*x*x*x+2*x*x*x-9*x*x-2x+8 x(x*x-6x-9)-x(x*x-8x-15)+2x(3-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^2-4x+3|+|x+1|>8 求x 求不等式2/x+6/x+12/x+20/x+...+9900/x>99 x-12=2x-20怎么求X? x-o.8x=6 12x-8x=4.8 3x-8=16 7.5x-2x x-0.7x=3.6 求答案 .X²+13X+36 .X²+5X-20 .X²-2X-15 .8（X²+X）²-8（X²+X）+12 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 (12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12求X |x|-2/x*x-x-12