15(x+2)(x-2)-3(2x-1)(2+1)>(x-2)(3x+1)解不等式.利用平方差公式
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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
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计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15)
[(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)]
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
因式分解1+x+x^2+x^3+```+x^15
(x+1)(x+2)(x+3)(x+4)-15
|x+1|-|x|+|x-2|-|-x+3|已知x+2
x{x+1}{x-1}}x-2}{x-3}-40
x^5-x^4+x^3-x^2+x-1
(X+1)X(X+2)X(X+3)=504
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^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1)
x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1
解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2
化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)