Question

a=1/2,b=1/3,则3a²-ab/3a²+5ab-2b²=

Answer 1

a=1/2,b=1/3,则

3a²-ab/3a²+5ab-2b²

=a（3a-b）/(3a-b)(a+2b)

=a/(a+2b)

=1/2/(1/2+2×(1/3))

=3/6/(3/6+4/6)

=3/7;

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