化简10/x+10/x+5=90/100
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
化简|x-5|+|x+10|-|x-15|,
|x+5|+|x-7|+|x+10|化简
化简:x平方-x-2/x平方-x-6除以x平方+4x-5/x平方+2x-10
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
(x+7/x+6)+ (x+9/+x+8)=(x+10/x+9)+(x+6/x+5)
1.x+9/x+8- x+10/x+9=x+6/x+5- x+7/x+6;
⒈ 解方程 (X+7)/(X+6)+(X+9)/(X+8)=(X+10)/(X+9)+(X+6)/(X+5)
x-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9
(x+2)(x-12)+(x+7)(x+8)+(x+5)(x-10),化简.
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550