Ответы на вопрос:
5/7 * (21/20 - 7/30) + 16/21 : 8/7 = 1 1/4 1) 21/20 - 7/30 = 63/60 - 14/60 = 49/60 2) 5/7 * 49/60 = (1*7)/(1*12) = 7/12 3) 16/21 : 8/7 = 16/21 * 7/8 = (2*1)/(3*1) = 2/3 4) 7/12 + 2/3 = 7/12 + 8/12 = 15/12 = 1 3/12 = 1 1/4 4/45 : (12/25 - 4/15) + 15/16 * 4/15 = 2/3 1) 12/25 - 4/15 = 36/75 - 20/75 = 16/75 2) 4/45 : 16/75 = 4/45 * 75/16 = (1*15)/(9*4) = 15/36 = 5/12 3) 15/16 * 4/15 = 4/16 = 1/4 4) 5/12 + 1/4 = 5/12 + 3/12 = 8/12 = 2/3
Решение: 2-2у+7/4=3-5у/3 к общему знаменателю 12 12*2-12*2у+7*3=12*3-4*5у 24+24у+21=36-20у 24у+20у=36-24-21 44у=-9 у=-9/45=-1/5 ответ: у=-1/5
Популярно: Математика
-
yuliyamusatova101.06.2023 14:43
-
ангелочек163114.10.2021 13:21
-
Ankur124.02.2022 16:25
-
liza143321.05.2020 00:11
-
Полина1111111С30.01.2022 04:06
-
yanbalan1930.03.2020 01:00
-
zzz179224.11.2020 20:23
-
dimka2zab17.11.2022 14:26
-
valenkov0523.01.2022 22:55
-
DashaRossgard15.01.2021 06:37