用n=4的复化梯形公式计算积分(int )_(1)^2dfrac (1)(x) dx，并估计误差。

2 分别用梯形公式和 Simpson 公式计算积分：int_(0)^1(x)/(4+x^2)dx，n=8；2 分别用梯形公式和 Simpson 公式计算积分：$

计算下列定积分.-|||-(int )_(sqrt {2)}^2dfrac (dx)(xsqrt {{x)^2-1}} ;

(int )_(1)^2dfrac (dx)(x(1+sqrt {2x))}=( )A.(int )_(1)^2dfrac (dx)(x(1+sqrt {2x

计算下列积分:-|||-(9) (int )_(-e)^-2dfrac (dx)(1+x);-|||-(10) (int )_(0)^dfrac (pi {4)

(int )_(1)^2dfrac (sqrt {{x)^2-1}}(x)dx

(1) (int )_(0)^2dfrac (dx)({(1-x))^2}

例28 计算下列积分:-|||-(1) (int )_(0)^2dfrac (x)({e)^x+(e)^2-x}dx ;

(int )_(0)^2dfrac (dx)({(1-x))^2};

(int )_(0)^2dfrac (dx)({(1-x))^2};;

估计下列各积分的值:-|||-(1) (int )_(1)^4((x)^2+1)dx;-|||-(2) (int )_(dfrac {pi )(4)}^dfra