x^2-4x=86x^2-4=3xx^2-根号6x+1=03x^2-5x-2=0t^2+3=2乘以根号2tx^2=3[2x-3]

7/xx+x+1/xx-1=2/xx-x 4/(xx-16)/2/x-4+x/x+4=? 因式分解(X+2)(X+3)+XX-4 已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值. 解方程:(2x+3)(x-4)-(x+2)(x-3)=xx+6 解方程:(2x+3)(x-4)-(x+2)(x-3)=xx-8 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 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 如果2XX+3X+7=8那么9-(4XX+6X)=?(XX就是X的平方,不会打X的平方)问YCZYCZ2503:为什么9-(4XX+6X)是2呢? 1,2,3,4,5,6,7,8,9,九个数字XX除X=XX除X=XX除X x^4+3x=2求解!求xx^4 表示X的四次方 解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)=5/(xx+11x-7 解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)=5/(xx+11x-708） 如下9*9宫图如何填x x x 1 x x x 2 9x x 5 x x x x x 4x 6 8 x x x x x xx x x 7 x x 5 x xx 2 x x 6 x x 8 xx x 3 x x 9 x x xx x x x 5 x 1 6 x 4 x x x 3 x x x x 7 x x x x 2 x x x 解方程2xX(7--2x)+5xX(8--x)=3xX(5--3x)--39 1/x-3-2=4-x/3xx/2x-5+5/5-2x=11/x-1=x-2/x+1-1 小数奥数网xx(x +1)x(x+ 2)x(x +3)=360怎样算? 在9x9的方格中,把1——9这9个数字填入方格中,每行每列都填这9个数,横竖都不能重复,8 X X X X X X X X X X 3 6 X X X X X X 7 X X 9 X 2 X XX 5 X X X 7 X X XX X X X 4 5 7 X XX X X 1 X X X 3 XX X 1 X X X X 6 8X X 8 5 X X X 1 XX