计算不定积分∫x√x2+1dx

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/21 19:30:06
计算不定积分∫x√x2+1dx计算不定积分∫x√x2+1dx计算不定积分∫x√x2+1dx∫x√(x^2+1)dx=(1/2)∫√(x^2+1)dx^2=(1/2)∫(x^2+1)^(1/2)d(x^

计算不定积分∫x√x2+1dx
计算不定积分∫x√x2+1dx

计算不定积分∫x√x2+1dx
∫x√(x^2+1)dx
=(1/2)∫√(x^2+1)dx^2
=(1/2)∫(x^2+1)^(1/2)d(x^2+1)
=(1/2)*[(x^2+1)^(1/2+1)/(1/2+1)]+C
=(1/3)(x^2+1)^(3/2)+C
=(1/3)*(x^2+1)/√(x^2+1)+C

∫x(√x^2+1)dx
=1/2∫(√x^2+1)dx^2
=1/3(x^2+1)^(3/2)

原式=1/2*∫√x^2+1d(x^2+1)=1/2*2/3*(x^2+1)3/2=1/3*(x^2+1)3/2
(x^2+1)3/2表示x的平方+1的三分之二次方
不知道你有没看明白:)不懂再pm我呵呵