50-51+52-53+54-55+56-57+58-59+60 - giúp tôi với
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1 tháng 7 2021
50) \(\sqrt{98-16\sqrt{3}}=4\sqrt{6}-\sqrt{2}\)
51) \(\sqrt{2-\sqrt{3}}=\dfrac{\sqrt{4-2\sqrt{3}}}{\sqrt{2}}=\dfrac{\sqrt{3}-1}{\sqrt{2}}=\dfrac{\sqrt{6}-\sqrt{2}}{2}\)
52) \(\sqrt{4+\sqrt{15}}=\dfrac{\sqrt{8+2\sqrt{15}}}{\sqrt{2}}=\dfrac{\sqrt{5}+\sqrt{3}}{\sqrt{2}}=\dfrac{\sqrt{10}+\sqrt{6}}{2}\)
53) \(\sqrt{5-\sqrt{21}}=\dfrac{\sqrt{10-2\sqrt{21}}}{\sqrt{2}}=\dfrac{\sqrt{14}-\sqrt{6}}{2}\)
54) \(\sqrt{6-\sqrt{35}}=\dfrac{\sqrt{12-2\sqrt{35}}}{\sqrt{2}}=\dfrac{\sqrt{14}-\sqrt{10}}{2}\)
55) \(\sqrt{2+\sqrt{3}}=\dfrac{\sqrt{4+2\sqrt{3}}}{\sqrt{2}}=\dfrac{\sqrt{6}+\sqrt{2}}{2}\)
56) \(\sqrt{4-\sqrt{15}}=\dfrac{\sqrt{8-2\sqrt{15}}}{\sqrt{2}}=\dfrac{\sqrt{10}-\sqrt{6}}{2}\)
23 tháng 12 2021
số số hạng có trong biểu thức trên là:
(58 - 40 ) : 1 + 1 = 19
=>( 40 - 41 ) + ( 42 - 43 ) + ... + ( 56 - 57 ) + 58
=> (-1) x [( 19 - 1 ) : 2 ] + 58
=> (-1) x 9 + 58
=> (-9) + 58
=> 49
HT~~~
27 tháng 12 2017
Đú đởn ăn chơi học hành sa sút đến nỗi có bài toán đơn giản như zậy mà cũng phải hỏi !
27 tháng 12 2017
40-41+42-43+44-45+46-47+48-49+50-51+52-53+54-55+56-57+58=
=40+(42-41)+(44-43)+(46-45)+(48-47)+(50-49)+(52-51)+(54-53)+(56-55)+(58-57)=49
TH
31 tháng 1 2023
ta có: 2005 + 53-54-55+56-57-58-59+60+61-62-63+64+65-66-67+68+69
= 2005+(53-54-55+56)+(57-58-59+60)+(61-62-63+64)+(65-66-67+68)+69
= 2005+0+0+0+0+69
= 2005+69
= 2074
20 tháng 2 2017
các phép tính trong ngoặc đều bằng 0
suy ra chỉ còn 2005 +69 = 2074
S
_silverlining
CTVVIP
15 tháng 8 2017
51. mysteries / seem / beyond / understanding.
those mysteries seem to be beyond understanding.
52. Peter / regret / not attend / lecture / last week.
peter regret not attending the lecture last week
53. time / train / leave / passengers / board.
By the time the train left, all the passengers had been on board.
54. we / upset / because of / failure.
we are upset because of our failure
55. policeman / talk / man / car / damage / accident.
The policeman is talking to the man whose car was dameged in the accident
56. I / spare time / read.
I spend my spare time reading books
57. despite / enthusiasm / he / not succeed.
despite his enthusiam, he didn't succeed
58. more / we / travel / learn.
the more we travel, the more we learn
59. mathematics / play / part / lives.
mathematics play an important part in our lives
60. if / Peter / money / lend / you.
If peter had a lot of money , he would lend you
CL
15 tháng 8 2017
.51. mysteries / seem / beyond / understanding.
There are many mysteries that seem to be beyond our understanding.
52. Peter / regret / not attend / lecture / last week.
Peter regretted not attending the lecture last week.
53. time / train / leave / passengers / board.
It was time for the train to leave so all the passengers got on board54. we / upset / because of / failure.
We were upset because of our fairlure.
55. policeman / talk / man / car / damage / accident.
The policeman was talking to the man whose car had been badly damaged in the accident.56. I / spare time / read.
I often spend my spare time reading books.
57. despite / enthusiasm / he / not succeed.
Despite his enthusiasm, he did not succeed.
58. more / we / travel / learn.
The more we travel, the more we learn.
59. mathematics / play / part / lives.
Mathematics plays an important part in our lives.
60. if / Peter / money / lend / you.
If Peter had enough money, he would lend you some.
S
_silverlining
CTVVIP
23 tháng 7 2017
Choose the best answer to complete the text.
You can't see our house (51)______ here because it is (52)______ the church. When you walk up Prince Street, it is (53)______ the left, next (54)______ the Black Cat Café.
My room is upstairs (55)______ the right. I have a desk (56)______ front (57)______the window. And I like looking out because our house is (58)______ the park. My desk is (59)______ the bed (60)______ the wardrobe.
51. A. from B. behind C. on D. in
52. A. in B. behind C. on D. between
53. A. on B. at C. in D. under
54. A. in B. at C. on D. to
55. A. in B. behind C. on D. next
56. A. on B. at C. in D. next
57. A. about B. of C. on D. with
58. A. near B. on C. next D. from
59. A. on B. in C. between D. at
60. A. on B. and C. in D. behind
đây đâu phải bài lớp 2 bn
=55 nhé