E=30+31+32+33...+150+151+152 = ?
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tính E=30 + 31 + 32 +...+ 150 + 151 + 152
29) The boys ___________________ stones. (not/ throw)30) _________ the bells of your church still ________________? (ring)31) They _________________ hockey at school. (play)32) She ______________________ e-mails. (not/ write)33) ___________ you ____________________ English? (speak)34) My parents _______________________ fish. (not/ like)35) ________ Anne _________________ any hobbies? (have)36) Andys brother ______________________ in an office. (work)37) Leroy ____________________ very fast. (can...
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29) The boys ___________________ stones. (not/ throw)
30) _________ the bells of your church still ________________? (ring)
31) They _________________ hockey at school. (play)
32) She ______________________ e-mails. (not/ write)
33) ___________ you ____________________ English? (speak)
34) My parents _______________________ fish. (not/ like)
35) ________ Anne _________________ any hobbies? (have)
36) Andy's brother ______________________ in an office. (work)
37) Leroy ____________________ very fast. (can/not/ read)
38) ________ Jim and Joe ___________ the flowers every week? (water)
39) Mary's mother _____________________ a motorbike. (not/ ride)
40) ___________ Elisabeth ___________________ cola? (drink)
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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1/31+1/32+1/33+.......+1/149+1/150
30 * 31 * 32 ×33×A = 864X304y
tinh nhanh
30+31+31+32+33+34+35+36+37+38+39
(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+34+35+36+37+38+39
=30+(31+39)+(32+38)+(33+37)+(34+36)+35
=30+70+70+70+70+35
=30+280+35
=310+35
=345
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(31 + 39) + (32 + 38) + (33 + 37) + (34 + 36) + (31 + 30 + 35) = 70 + 70 + 70 + 70 + 96 = 376
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30 cộng 31 ,32 cộng 33.......cộng 40
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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A = 26 + 27 + 28 + 29 + 30 + 31 + 32 + 33
Số các số hạng là :
(33 - 26) + 1 = 8 (số hạng)
Tổng trên = (33 + 26) . 8 : 2 = 236
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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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A=26+27+28+29+30+31+32+33
A=(26+33)+(27+32)+(28+31)+(29+30)
A=59+59+59+59=59x4=236
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A= 26+ 27+28+29+30+31+32+33