Question

\displaystyle\int_{ 0 }^{ x } \displaystyle\int_{ 0 }^{ e-x } \displaystyle\int_{ 0 }^{ e-x-y } (x ^ { 2 } +y ^ { 2 } +z ^ { 2 } ) d z d y d x
$\displaystyle\int_{ 0 }^{ x } \displaystyle\int_{ 0 }^{ e-x } \displaystyle\int_{ 0 }^{ e-x-y } (x ^ { 2 } +y ^ { 2 } +z ^ { 2 } ) d z d y d x$
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Answer 1

Answer:

what is this question pls explain

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