计算下列积分的值. [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]为由[tex=3.071x1.143]fMZAWLN92hfeusjbot5s5g==[/tex]和[tex=3.0x1.214]E7sPOleL/46hoHosj10jYQ==[/tex]所围矩形边界正向：[tex=4.643x2.643]TKtuaXU5OgHyeSSmH7Xpd1CjeANnDMTpDWNt/AD98zqqr9s+8kTmBF2jQzqEz/aQ[/tex].（见图3.20）[img=304x252]178c8d399bbe2cf.png[/img]
举一反三
- 计算下列积分的值. [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]为由[tex=3.071x1.143]fMZAWLN92hfeusjbot5s5g==[/tex]和[tex=3.0x1.214]E7sPOleL/46hoHosj10jYQ==[/tex]所围矩形边界正向：[tex=9.786x2.786]FE2emU4+moBspjp3OOFOx8MrqyT3ut+0VHxUql1AIaD7OqXB9+1efqFwXuvNRszbmnbD8QrwaljpImVLxAZQ2sUubx5GJRPJd8puAgEE6J4jCcCDqCuOm3CUVoI7tJFG[/tex].（见图3.20）[img=304x252]178c8d399bbe2cf.png[/img]
- 计算下列积分的值. [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]为由[tex=3.071x1.143]fMZAWLN92hfeusjbot5s5g==[/tex]和[tex=3.0x1.214]E7sPOleL/46hoHosj10jYQ==[/tex]所围矩形边界正向：[tex=4.786x2.643]G8Basw+pnuC4PEhmMHYw7/lLkCR2nVtnUh+NALMWczM6CYTbSjgsnCVO53sL4EHjChXbCLaWYvuh19q6ey93fg==[/tex].（见图3.20）[img=304x252]178c8d399bbe2cf.png[/img]
- 计算下列积分的值. [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]为由[tex=3.071x1.143]fMZAWLN92hfeusjbot5s5g==[/tex]和[tex=3.0x1.214]E7sPOleL/46hoHosj10jYQ==[/tex]所围矩形边界正向：[tex=6.071x2.714]FE2emU4+moBspjp3OOFOxzdA51HVnSQd7zAo4SfkZ3pC9EWTyUydAWQ/hsalqP/aNkvMJHk0WuIgRkHM8wkbNQ==[/tex].（见图3.20）[img=304x252]178c8d399bbe2cf.png[/img]
- 设随机变量(X,Y)的概率分布列为[img=345x154]178ab1c9ce3bc1b.png[/img]求[tex=1.571x1.0]JUrGU6ftUjxQCIr6CyfDwQ==[/tex],[tex=1.357x1.0]yL/7/hhyqgwzAX8jnIq3OQ==[/tex],[tex=4.357x1.357]LN0xwhQHSOeLwBClUlpHQw==[/tex].
- 计算积分[tex=8.071x2.643]OLgK4vtLcwvh6iS+aVoSH47SlFSnH7fcv1ecWqv2Q48KpSBaSELR9jA5b7TbKeAP1WDQkbjiPI6sFsx9oC2z7A==[/tex] 其中[tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex]为正向圆周 [tex=4.214x1.357]I8OhSf6VthyLUVMZG1fj7Q==[/tex]