А)
54÷27+90÷30=5
1) 54÷27=2
2) 90÷30=3
3) 2+3=5
б)
(537-63)÷100=4.74
1) 537-63=474
2) 474÷100=4.74
в)
400×14÷7=800
1) 14÷7=2
2) 400×2=800
г)
(2345+4571)×(400-800÷2)=0
1) 2345+4571=6916
2) 800÷2=400
3) 400-400=0
4) 6916×0=0
<span>32/8 = 16/4;</span>
<span> 7,5/2,5 = 15/5;</span>
<span>2,5/10 = 1/4;</span>
<span> 2/12 = 3/18;</span>
<span> 9/3 = 24/8;</span>
<span> 4,8/1,2 = 8/2;</span>
<span> 3/12 = 2/8;</span>
<span> 1/42 = 3/126.</span>
1. 5ч34мин=334мин
2. 25мин15сек =1515сек
3. 2ч48мин27сек =6507сек
4. 2880мин =172800сек.
5. 3240сек =54мин
6. 5040сек =84мин = 1ч24мин