2x=7x-15
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2x=7x-15
2x=7x-15
2x=7x-15
7x-2x=15
5x=15
x=3
5x=15
x=3
7x-2x=15,5x=15,x=3
3
2x=7x-15
7×【2x-3】+15=2x-5 x=?3x-5=2×【2x-4】 x=?6x【x-2】-10=5×【x+8】 x=?
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)]
*-----------------------------------------------*| 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(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
因式分解 (x+1)(x+2)(x+5)(x+7)+15
(x+1)(x+2)(x+5)(x+7)+15 因式分解
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/x+3-x+1/x+2=x+8/x+9-x+7/x+8
(x^2+x-1)-4x^2-4x+7-2x^2+15x-7
解方程 6x(7-x)=36-2x(3x-15)
4x-2=3x+1 -x+3=10 x-7=11-x x=四分之一x+6
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程
已知x-3x+1=0,计算2x-3x-7x+2009
15-(7-4x)=2x+(5-2x) 4分之X减8分之3X减1=1 0.7分之X-0.03分之0.17-0.2X=1
计算 已知x是15的平方根,求代数式x(x+1)^2-x(x^2+x)-x-7
求解2X*X-6X=5X-15在线等 还有是x*x-7x+12