Вычислите:
26-2*(53-31) = 26-2*22 = 26-44 = -18
1 1/7+3/5-31/35 =
= (1*7+1)/7 + 3/5 - 31/35 =
= 8/7 + 3/5 - 31/35 =
= (8*5 + 3*7)/(7*5) - 31/35 =
= (40+21)/35 - 31/35 =
= 61/35 - 31/35 =
= (61-31)/35 =
= 30/35 = 6/7
Найдите:
3/7 от числа 420 = 420*3/7 = 60*3 = 180
24*1,3 : 3 = 8*1,3 = 10,4
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Вычислите:
26-2*(53-31) = 26-2*22 = 26-44 = -18
Вычислите:
1 1/7+3/5-31/35 =
= (1*7+1)/7 + 3/5 - 31/35 =
= 8/7 + 3/5 - 31/35 =
= (8*5 + 3*7)/(7*5) - 31/35 =
= (40+21)/35 - 31/35 =
= 61/35 - 31/35 =
= (61-31)/35 =
= 30/35 = 6/7
Найдите:
3/7 от числа 420 = 420*3/7 = 60*3 = 180
Вычислите:
24*1,3 : 3 = 8*1,3 = 10,4