简便计算 13×19/17-2/17×13 5/17-(7/8-12/17) 3/5+2/9+1/5÷1/2 1/5×2
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13×19/17-2/17×13

=13(19/17-2/17)

=13

5/17-(7/8-12/17)

=5/17+12/17-7/8

=1/8

3/5+2/9+1/5÷1/2

=3/5+2/5+2/9

=11/9

1/5×2/9÷7/9-5

=1/5(2/9×9/7)-5

=1/5×2/7-5

=-173/35

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