3-4/11-7/1117×13/16

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3-4/11-7/1117×13/16
3-4/11-7/11
17×13/16

3-4/11-7/1117×13/16
3-4/11-7/11
=3-(4/11+7/11)
=3-1
=2
17×13/16
=(16+1)×13/16
=16×13/16+1×13/16
=13+13/16
=13又16分之13

1. 3-(4/11+7/11)=3-1=2
2. (16+1)x13/16=13+13/16=13又十六分之十三