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问题: 问题

=100*A+3*A*10+3*A/2=263*A/2 怎么得263???

解答:

=100*A+3*A*10+3*A/2
=[100+3*10+(3/2)]*A
=[100+30+(3/2)]*A
=[130+(3/2)}*A
=[(260/2)+(3/2)]*A
=(263/2)*A
=263*A/2