4x^2-1=12xX(X-7=8(7-X)
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7/xx+x+1/xx-1=2/xx-x
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)
4x^2-1=12xX(X-7=8(7-X)
1,2,3,4,5,6,7,8,9,九个数字XX除X=XX除X=XX除X
解方程2xX(7--2x)+5xX(8--x)=3xX(5--3x)--39
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
7/(XX+X)+1/(xx-x) =6/(xx-1)
解分式方程7/(XX+X)+1/(xx-x) =6/(xx-1)
7/(XX+X)+1/(xx-x) =6/(xx-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?
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
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
x/xx+x+1=1/4 求xx/xxxx+xx+1
1 2 3 6 7 8 9怎么排列成等式 数字不能重复XX-X=X+X=XX
7 X 4 6 1 2 X X XX 2 X X X 3 X X X 5 X X X 9 7 X 6 XX X 6 7 2 X 5 1 XX X 2 X X X 6 X XX 1 5 X 4 6 7 X X X 3 X 8 6 X X X 9X X X 1 X X X 7 XX X X 2 7 5 8 X 1第二道~X 9 X X 8 X X 1 XX 6 X X 2 X X 4 X1 X X X X X X X 59 5 X 7 3 4 X 6 16 7 X 8 X 2 X 3 4
已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神