5x+10=20
X+1-3X=5X+10 6-3X=5X-20
10*20%+2X*5%=(10+X+2X)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x-8/5x=15 5/1x+10/3x=120 20%x=30
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+1/10-x-1/5=1 x/12-2x-1/20=3x+4/8-
(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
4x-3x(20-x)=5x-7x(20-x)