40/100*x+(120/10-x)*50/100=7/5
2x+3x+4x+5x+x+6x+7x=100
(X+X)+(X-X)+(X*X)+(X/X)=100
1x+2x+3x+4x+5x+6x+7x…+99x=100
先化简再求值(x+3x+5x+7x+.+101x)-(2x+4x+6x+...100x),其中x=51分之2
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
X>7,x=100 x
(X/80+X/100 +5)*40=X,
(x-10)/x*100%=50%求解
1.2(x-2)-3(4x-1)=9(1-x) 2.11x+64-2x=100-9x 3.15-(8-5x)=7x+(4
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
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),