1)Минута -- 60сек. ==> 60ш(шаги)/мин
Час 60 минут. ==> 1ч=60×60=3600. 3600ш/ч
2)В метрах? 1м=100 см. 10000×0.9=9000
3)Сутки 24 часа. 24+24+6=53ч.
53×5=265км=265000м.
Решение:
1)2х+14+4х=6х+14
2)27-9у+15=42-9у
3)11х+66+34=11х+100
4)15у+135-7у=8у+135
5)90+18х+12х=90+30х
6)22у+88-19у=88-3у
7)32х+256-91=32х+165
8)100-25у-76=24-25у
9)46х-138+14х=60х-138
1) 5*10=50 (коп.)
2)4*5=20(коп.)
3)50+20=70(коп.)
X/12 = 3/4
x=12*3/4
x=9-числитель
Ответ: 9/12
1)<span> 7/9 +3 2/9 = 7/9 + 29/9 = 36/9 = 4
2) 9 - 5 1/4 = 36/4 - 21/4 = 15/4 = 3 3/4
3) 1 7/8 + 2 6/8 = 15/8 + 22/8 = 37/8 = 4 5/8
4) 4 5/7 - 1 6/7 = 33/7 - 13/7 = 20/7 = 2 6/7
5) 15 2/9 - (7 1/9 + 4 5/9) = 137/9 - (64/9 + 41/9) = 137/9 - 105/9 = 32/9 = 3 5/9
6) (2 5/7 + 8 2/7) - 4 7/8 = (19/7 + 58/7) - 39/8 = 77/7 - 39/8 = 11 - 39/8 =
= 88/8 - 39/8 = 49/8 = 6 1/8
7) (4 2/5 + 3 4/5) - (12 - 8 1/5) = (22/5 + 19/5) - (60/5 - 41/5) = 41/5 - 19/5 = 22/5 =
= 4 2/5
8) 12 6/11 - (5 4/11 + 6 9/11 - 2 3/11) = 138/11 - (59/11 + 75/11 - 25/11) =
= 138/11 - 109/11 = 29/11 = 2 7/11
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