Ответ:
1) 3/4÷5/6=3/4*6/5=9/10
2) 21/2*2/5=21/5
3)1÷11/6=1*6/11=6/11
4) 9/10+21/5=9/10+42/10=51/10
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Ответ:
1) 3/4÷5/6=3/4*6/5=9/10
2) 21/2*2/5=21/5
3)1÷11/6=1*6/11=6/11
4) 9/10+21/5=9/10+42/10=51/10