N.270
1) 25/80+45/60=5/16+3/4=5+12/16=17/16
2) 20/45 + 26/54 = 4/9 + 13/27 = 12/27 + 13/27 = 25/27
3) 36/300 + 12/40 - 350/1000 = 12/100 + 3/10 - 35/100 = 12+30-35/100 = 7/100
4) 14/24 - 39/90 + 15/100 = 7/12 - 13/30 + 3/20 = 35-26+9/60 = 18/60 = 3/10
5) 42/120 + 20/32 - 28/160 = 7/20 + 5/8 - 7/40 = 14+25-7 = 32/40 = 4/5
6) 45/72 - 33/144 - 20/64 = 5/9 - 33/144 - 5/16 = 17/36
N.272
1)
НОК (25;40) = 200.
8*8/25*8 и 13*5/40*5 = 64/200 и 65/200.
64/200 < 65/200; 8/25 < 13/40.
2) 65/200 - 64/200 = 1/200 м -разница
Ответ: У Щукина рыба длинее; на 1/200 метра