Ta đặt:
M= (2021+2019+2017+...+11+9+7)×(7×8-4×12)
A B
A có số số hạng là:
(2021-7):2+1=1008(số)
Trong đó có số cặp có tổng =2028 là:
1008:2=504(cặp)
A=2028x504=1022112
B=7x8-4x12=
M=1022112x8=8176896
Đáp án+Giải thích các bước giải:
Đề sai sửa lại là:`(2021+2019+2017+.....+1+9+7)xx(6xx8-4xx12)`
`(2021+2019+2017+.....+1+9+7)xx(6xx8-4xx12)`
`=(2021+2019+2017+.....+1+9+7)xx(48-48)`
`=(2021+2019+2017+.....+1+9+7)xx0`
`=0`
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Các bạn giải giải giúp mình nữa nhé!! Cảm ơn trước ạ!
Exercise 4. What do you say in these situations? Write sentences with Shall I? or Shall we? 1 You and a friend want to do something this evening but you don't know what. You ask your friend. - .What shall we do this evening? 2. You try on a jacket in a shop. You are not sure whether to buy it or not. You ask a friend for advice. - …………………………………………………………………………………… 3. It's Ann’s birthday next week. You want to give her a present but you don't know what. You ask a friend for advice. - …………………………………………………………………………….. 4. You and a friend are going on holiday together but you haven't decided where. You ask him/her. - ………………………………………………………………………………….. 5. Your friend wants you to phone later. You don’t know what time to phone. You ask him/her.
còn mỗi câu này nhanh cho hn Ex 15. Complete the second sentence so that it has the same meaning as the first one. 1. What is your hobby? → What hobby _____________________________________________________ 2. We all find painting interesting because it’s a creative activity. → We all think _____________________________________________________ 3. His hobby is collecting toy cars. → He collects ______________________________________________________ 4. It isn’t necessary to finish the work today. → You don’t _______________________________________________________ 5. When did you start your hobby? → How long _______________________________________________________ 6. It took me three hours to make this pottery jug. → I spent __________________________________________________________ 7. My father likes to do gardening at the weekend. → My father enjoys _________________________________________________ 8. Why don't we go swimming this afternoon? → What about ______________________________________________________
giải thích từ 1->13 là đc còn đou là đáp án ko thì đáp án thôi cũng đc nhưng phải đúng nhé
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