Trong các phương trình:   0 1 x x x -1  .x 1 2 2  2x - 3  -1 3 .x  2  3 4 Có 2 phương trình tương đương với nhau là A1&2 B2&3 C2&4 D.1&3

c/tỏ rằng A=1/2^2+1/4^2+...+1/98^2+1/100^2<1/2 CÁC BẠN GIÚP MÌNH VỚI MÌNH SẼ VOTE 5*

Chiều cao của 50 học sinh lớp 5 (tính bằng cm) được ghi lại như sau: 102 113 138 111 109 98 114 101 1021 11 127 118 111 130 124 115 122 126 103 108 134 108 118 122 99 109 106 109 107 106 122 133 124 108 .102 130 107 114 104 100 104 141 103 108 118 113 138 112 147 114 a) Lập bảng phân phối ghép lớp (98-102); (103-107);…;(143-147) b) Tính số trung bình cộng.

Giải các hệ phương trình a/x=35(y+2) X=50(y-1) B/(x+14).(y-2)=xy (X-4).(y+1)=xy

Giúp em với càng nhanh càng tốt

Giai giup minh nha moi nguoi minh dang can gap

Ngừ lạ ơi xin hãy làm giùm tuii

1.Tính tổng: a. Của tất cả các số lẻ bé hơn 100 b. 1+4+9+16+.......+169 2.tính nhanh tổng của tất cả các số có 3 chữ số 1,2,6,12,24,48,96,192,384 CẢM ƠN GIÚP MIK NHÉ

lm nhanh giúp mk với nếu các bạn giúp mk mk sẽ vote 5 sao và cho câu trả lời hay nhất

Exercise 15. Put the verbs in brackets in the correct tense forms to complete the sentences. 1. I (study) at 8.00 tomorrow. 2. You (wait) for her when her plane arrives tonight? 3. Don’t phone me between 7 and 8. We (have) dinner then. 4. What clothes do you think she (wear) when she arrives? 5. I (send) in my application tomorrow. 6. Linda (arrive) in Ha Noi around March. 7. Next week at this time, you (lie) on the beach. 8. My uncle can’t come to your party tomorrow night because he (work) at night. 9. You (meet) your former teachers at 9 a.m. tomorrow morning, won’t you? 10. At this time tomorrow evening, I (play) computer games in my bedroom. Exercise 16. Put the verbs in brackets in the correct verb form. 1. I (think) that mountain-climbing is very dangerous. 2. My father (like) collecting stamps so much. 3. She (take) a lot of photos when she (go) on holidays. 4. I like drawing very much. My hobby is (paint) . 5. My mother says when she (retire) , she (go) back to her village to do the gardening. 6. your sister (like) (make) model in her free time? 7. My brother (promise) that he (give) me a nice doll on my birthday. 8. Duong says he loves horse-riding but he (not/ continue) this hobby from next year. 9. My aunt (play) the guitar once a week. 10. Don't worry. I (dance) with you next Sunday.