Question

Вычислите удобным способом
1)2/3+1/2
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5/6-1/4
2)1/4-2/15
_________
5/12-2/5

Answer 1

1) (2/3+1/2):(5/6-1/4)=2
1. 2/3+1/2=4/6+3/6=7/6
2. 5/6-1/4=10/12-3/12=7/12
3. 7/6:7/12=7/6*12/7=2

2) (1/4-2/15):(5/12-2/5)=7
1. 1/4-2/15=15/60-8/60=7/60
2. 5/12-2/5=25/60-24/60=1/60
3. 7/60:1/60=7/60*60/1=7