4楼: Originally posted by zyh700600 at 2022-11-25 10:34:14
更正：

  

x = exp(y) + 3*y
dx =  (exp(y) + 3)*dy

被积函数可转化成：
y*(exp(y) + 3)*t

y的积分区间：

计算程序：

F = @(t,y) y*(exp(y) + 3)*t;
Q = dblquad(F,0,5,-0.2576,1.6308)

计 ...

  
F = @(t,y) y.*(exp(y) + 3).*t;
Q = dblquad(F,0,10,-0.2576,0.8706)

  


x = exp(y) + 3*y
dx =  (exp(y) + 3)*dy

被积函数可转化成：
y*(exp(y) + 3*y)*t

y的积分区间：[-0.2576,1.6308]


F = @(t,y) y*(exp(y) + 3*y)*t;
Q = dblquad(F,0,5,-0.2576,1.6308)

Q = 106.8541

3楼: Originally posted by zyh700600 at 2022-11-24 22:42:52
x = exp(y) + 3*y
dx =  (exp(y) + 3)*dy

被积函数可转化成：
y*(exp(y) + 3*y)*t

y的积分区间：


F = @(t,y) y*(exp(y) + 3*y)*t;
Q = dblquad(F,0,5,-0.2576,1.6308)

Q = 106.8541


...

  

x = exp(y) + 3*y
dx =  (exp(y) + 3)*dy

被积函数可转化成：
y*(exp(y) + 3)*t

y的积分区间：[-0.2576,1.6308]

计算程序：

F = @(t,y) y*(exp(y) + 3)*t;
Q = dblquad(F,0,5,-0.2576,1.6308)

计算结果：
Q = 101.0479