1) Ответ: 3/5
2/7 ≈0,29
3/5 =6/10=0,6
0.6> 0.55>0.5>0.29
4)
(13/21 +3/14) :10/27= 2 1/4
1) 13/21 +3/14 = 26/42 + 9/42 = 35/42 = 5/6
2) 5/6 : 10/27 = 5/6 * 27/10 = (1*9)/(2*2)=9/4 = 2 1/4
5)
(17/8 - 11/20) : 5/46=14,49
1) 17/8 - 11/20 = (340/160 - 88/160) = 252/160= 63/40 = 1 23/40
2) 1 23/40 : 5/46 = 63/40 * 46/5 = (63*23)/(20*5) =
=1449/100= 14 49/100 = 14,49
6)Ответ: (1/2 - 1/3)
2/0,3 = 20/3 = 6 2/3≈6,67
2*0,3 = 0,6
1/2 - 1/3 = 3/6 - 2/6 =1/6≈0,17
1/2 + 1/3 = 3/6 +2/6 = 5/6≈0,83
0.17< 0.6<0.83<6.67 ⇒ (1/2 -1/3) < (2*0.3) <(1/2+1/3)<(2/0.3)