作业帮 > 数学 > 作业

∫(√x)/[1-(√x)^(1/3)]dx

来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/18 17:05:42
∫(√x)/[1-(√x)^(1/3)]dx
∫(√x)/[1-(√x)^(1/3)]dx
求不定积分∫(√x)/[1-(√x)^(1/3)]dx
令√x=u³,则x=u⁶;dx=6u⁵du;
故原式=6∫[u⁸/(1-u)]du=-6∫[u⁸/(u-1)]du
=-6∫[u⁷+u⁶+u⁵+u⁴+u³+u²+u+1+1/(u-1)]du
=-6[u⁸/8+u⁷/7+u⁶/6+u⁵/5+u⁴/4+u³/3+u²/2+u+ln∣u-1∣]+C
=-6[(1/8)x^(4/3)+(1/6)x+(1/5)x^(5/6)+(1/4)x^(2/3)+(1/3)x^(1/2)+(1/2)x^(1/3)
+x^(1/6)+ln∣x^(1/6)-1∣+C