E=30+31+32+33...+150+151+152 = ?
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29) The boys _____________don't throw______ stones. (not/ throw)
30) ____Do_____ the bells of your church still _____ring___________? (ring)
31) They _________play________ hockey at school. (play)
32) She __________doesn't write____________ e-mails. (not/ write)
33) _____Do______ you ______speak______________ English? (speak)
34) My parents _____________don't like__________ fish. (not/ like)
35) _____Does___ Anne ________have_________ any hobbies? (have)
36) Andy's brother ___________works___________ in an office. (work)
37) Leroy ______________can't read______ very fast. (can/not/ read)
38) ____Do____ Jim and Joe ____water_______ the flowers every week? (water)
39) Mary's mother _____________doesn't ride________ a motorbike. (not/ ride)
40) ______Does_____ Elisabeth _______drink____________ cola? (drink)
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(31+39)+(32+38)+(33+37)+(34+36)+(30+31+35)=70+70+70+70+96=376
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30 + 31 + 32 + 33 + ... + 40
Bài giải
Có tổng số số hạng là : 40 - 30 + 1 = 11
Tổng dãy số trên là : ( 40 + 30 ) x 11 : 2 = 385
Vậy tổng dãy số trên là : 385
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Số các số hạng là :
(33 - 26) + 1 = 8 (số hạng)
Tổng trên = (33 + 26) . 8 : 2 = 236
A = 26 + 27 + 28 + 29 + 30 + 31 + 32 + 33
=> A = (26 + 33) + (27 + 32) + (28 + 31) + (29 + 30)
=> A = 59 + 59 + 59 + 59
=> A = 59 x 4 = 236
Đặng thị Mỹ Linh ****- cho mk nhoe's
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E = (30+152)+(31+151)+(32+150)+...+(75+77)+76
E = 152+152+...+152+76
E = 152.61+76
E = 9272+76
E = 9348