|x-3|-3-|||-(3)下列各组中,两个函数为同一个函数的组是 () 。(2012计算机选择2)-|||-(2) (x)=(x)^2+3x-1 (t)=(t)^2+3t-1; (B) (x)=dfrac ({x)^2-4}(x-2) (x)=x+2;-|||-(x)=sqrt (x)sqrt (x-1), (x)=sqrt (x(x-1)), (D) (x)=3, (x)=|x|+|3-x|

计算函数极限(1)lim _(xarrow 1)dfrac (x-3)(x+2)(2)lim _(xarrow 1)dfrac (x-3)(x+2)(3)lim

下列函数中哪一个是微分-|||-方程 -3(x)^2=0 的解( ) ()-|||-A =(x)^2-|||-B =-(x)^3-|||-C =-3(x)^2-

若方程组 ) 7(x)_(1)+8(x)_(2)+9(x)_(3)=0 -(x)_(2)+2(x)_(3)=0 2(x)_(2)+t(x)_(3)=0 .=

2.求下列函数的导数:-|||-(1) =(x)^3+dfrac (7)({x)^4}-dfrac (2)(x)+12 ;-|||-(2) =5(x)^3-(2

4.已知两个线性变换:-|||- ) (y)_(1)=(x)_(1)+2(x)_(2)+3(x)_(3) (y)_(2)=-(x)_(1)+3(x)_(2)-

【题目】-|||-函数 (x)=dfrac (1)(3)(x)^3-(x)^2-3x+3 的极小值为f( __ )= __

已知两个线性变换： ) (y)_(1)=2(x)_(1)+(x)_(2) (y)_(2)=3(x)_(1)-(x)_(2)+2(x)_(3) (y)_(3)=

求下列函数的定义域：（1）y=sqrt(2x+4)；（2）y=(1)/(x-3)+sqrt(16-x^2)；（3）y=ln（x2-2x-3）；（4）y=(sqr

解方程组： ) (x)_(1)-(x)_(2)-(x)_(3)=2 2(x)_(1)-(x)_(2)-3(x)_(3)=1 3(x)_(1)+2(x)_(2)

解下列线性方程组 ) (x)_(1)+2(x)_(2)+3(x)_(3)=1 2(x)_(1)+2(x)_(2)+5(x)_(3)=2 3(x)_(1)+5(