Вычислите (30: 27-1/3)*2целых 1/7+2/5
Ответы
Пошаговое объяснение:
№1
1-2/9=9/9-2/9=7/9 (осталось выполнить)
№2
70/105 (Сокращаем на 5)=14/21 (Сокращаем на 7)=1/3
№3
1/7+3/4 (домножаем для общего знаменателя 28)=4/28+21/28=25/28
№4
=1114*(-35)/4=-38990/4 (сокращаем на 2)=-19495/2=-9747
=-9747,5
№5
7/25*5=35/25 (сокращаем на 5)=7/5=1
=1,4
№6
9/28:18/35=(9*35)/(28*18) сокращаем 9 и 18 (делим на 9)=35/56=5/8
№7
5/6*х=4(1/2)
х=4(1/2)/(5/6)
х=27/5=5,4
№8
7/8*7/8=49/64
№9
5/7*35=25 (см)
№10
4(5/11)*22/98=49/11*22/98 (сокращаем (49 и 98) и (11 и 22))=2/2=1
№11
60/2*5=150
№12
Всего 68 га
Первый день 68*1/4=17 га
Второй день (68-17)*2/3=34 га
Третий день 68-17-34=17 га
№13
(7/12+11/30х):7/14=1/3
(7/12+11/30х)*14/7=1/3
22/30х=1/3-14/12
22/30х=-5/6
х=-25/22=-1
Что то типо этого:
I live in a comfortable city flat in a 9-stored block of flats not far from the centre of Samara. It is not a very green place, but still there are many trees around the house and in summer the yard looks very beautiful and cozy. The house is located comfortably because there a few supermarkets, pharmacies around and a cinema.My flat is on the fourth floor. It’s very comfortable and well-planned. There are three rooms, a kitchen, a bathroom and a balcony overlooking the yard.We have all modern conveniences, such as central heating, electricity, cold and hot running water and a telephone. The largest room in our flat is the living room. My family uses it as a sitting room. There is a sofa, two armchairs, a small glass coffee table, a TV set on the wall and a DVD player in it. We use this room to meet the guests and to celebrate all holidays and important family occasions.Two other rooms are a bedroom of my parents and my bedroom. My room is rather small but it is very cozy. I like it so much, because this is my own place, my own corner.I have all the things that I need there – a soft bed at the right corner, a table near the window with a computer and a wardrobe near the wall.Our kitchen is not very large but it’s light. It’s very well-equipped. We have got a refrigerator, a microwave oven, an electric teapot, a coffee maker and a toaster and a lot of other household stuff. My mum likes cooking very much and in the evenings my family likes having dinner together in the kitchen – it’s our family tradition
I live in a comfortable city flat in a 9-stored block of flats not far from the centre of Samara. It is not a very green place, but still there are many trees around the house and in summer the yard looks very beautiful and cozy. The house is located comfortably because there a few supermarkets, pharmacies around and a cinema.My flat is on the fourth floor. It’s very comfortable and well-planned. There are three rooms, a kitchen, a bathroom and a balcony overlooking the yard.We have all modern conveniences, such as central heating, electricity, cold and hot running water and a telephone. The largest room in our flat is the living room. My family uses it as a sitting room. There is a sofa, two armchairs, a small glass coffee table, a TV set on the wall and a DVD player in it. We use this room to meet the guests and to celebrate all holidays and important family occasions.Two other rooms are a bedroom of my parents and my bedroom. My room is rather small but it is very cozy. I like it so much, because this is my own place, my own corner.I have all the things that I need there – a soft bed at the right corner, a table near the window with a computer and a wardrobe near the wall.Our kitchen is not very large but it’s light. It’s very well-equipped. We have got a refrigerator, a microwave oven, an electric teapot, a coffee maker and a toaster and a lot of other household stuff. My mum likes cooking very much and in the evenings my family likes having dinner together in the kitchen – it’s our family tradition
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(30 : 27 - 1/3) * 2 целых 1/7 + 2/5 = 2 целых 82/105
1) 30 : 27 = 30/27 = 1 целая 3/27 = 1 целая 1/9
2) 1 целая 1/9 * 2 целых 1/7 = 10/9 * 15/7 = (10*5)/(3*7) = 50/21 = 2 целых 8/21
3) 2 целых 8/21 + 2/5 = 2 целых 40/105 + 42/105 = 2 целых 82/105