Надежда Касапенко
Мыслитель
(9491)
1 месяц назад
У2.1.а)7/10>31/45, т.к 63/90>62/90
б)7/16>7/17, т.к. 1/16>1/17
в)37/36>0,72, т.к. 37*25/900=925/900,
72*9/900=648/900, т.е. 925/900>648/900
2.а)...=6 9/9 - 4 5/9=2 4/9
б)...=4 18/60 + 1 25/60=5 (18+25)/60=5 43/60
в)...=6 30/42+ 2 27/42=8 57/42=9 15/42
г)...=5 2/12 - 3 9/12=4 14/12 - 3 9/12=1 5/12
3.3 1/2+4 11/15 +1 3/5=
=(3 15/30)+(4 22/30)+(1 18/30)=
=8 (15+22+18)/30=8 55/30= 9 15/30=9 1/2
4.у+4 7/10=5 8/15
у=5 16/30 - 4 21/30
у=4 46/30- 4 21/30
у=25/30
у=5/6