Выполните действие: 5/46+7/69+1/3; 121/350-47/140; 31/48+17/40-7/16.

а) 5/46 + 7/69 + 1/3;

5 : 46 = 0,1;

7 : 69 = 0,1;

1 : 3 = 0,3;

0,1 + 0,1 = 0,2;

0,2 + 0,3 = 0,5

 5/46 + 7/69 + 1/3 = 5/10.

б) 121/350 - 47/140;

121 : 350 = 0,34;

47 : 140 = 0,33;

0,34 - 0,33 = 0,01.

121/350 - 47/140 = 1/100.

в) 31/48 + 17/40 - 7/16;

31 : 48 = 0,64;

17 : 40 = 0,42;

7 : 16 = 0,43;

0,64 + 0,42 = 1,06;

1,06 - 0,43 = 0,63.

31/48 + 17/40 - 7/16 = 63/100.

 

5/46+7/69+1/3= 15/138+14/138+46/138=75/138=25/46
121/350-47/140=242/700-235/700=7/700=0.01
31/48+17/40-7/16=155/240+102/240-105/240=152/240=19/30