Problem-solving process in higher mathematics - Training Enrollment Network

Problem-solving process in higher mathematics

∫∫D (3x+2y)dσ

=∫(0， 1) dx∫(0， 1–x)(3x+2y)dy

=∫(0， 1) dx (3xy+y？ )|(0， 1–x)

=∫(0， 1)( 1+x–2x？ )dx

=(x+x？ /2–2 times? /3)|(0, 1)

= 1+ 1/2–2/3

=5/6

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