15x150+15x400+150
K
Khách
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LT
2
MT
22 tháng 6 2015
a)7+10+13+16+...+37
=(7+37)+(10+34)+...+(19+25)+22(4 cặp)
=44.4+22
=198
b)2+3+4+...58
=(2+58)+(3+57)+...+(29+31)+30(28 cặp)
=60+60+...+60+30
=60.28+301710
c)75x18+75.52+15x150
=75.18+75.52+15.2.75
=75(18+52+15.2)
=75.(18+52+30)
=75.100
=7500
22 tháng 6 2015
a,b, dãy số viết theo qui luật cơ bản rồi. c,75x17+75x52+15x150=75x17+75x52+30x75=75x(17+52+30)=75x99=...
VN
Võ Ngọc Phương
VIP
28 tháng 12 2023
150 x 1 + 150 x 2 + 150 x 3 +...+ 150 x 99 + 150 x 100
= 150 x ( 1 + 2 + 3 + ... + 99 + 100 )
= 150 x 5050 = 757500
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
28 tháng 12 2023
B = 150 x 1 + 150 x 2 + 150 x 3 + ... + 150 x 99 + 150 x 100
B = 150 x (1 + 2 + 3+... + 99 + 100)
Đặt: A = 1 + 2 + 3 +...+ 100
Dãy số trên là dãy số cách đều với khoảng cách là:
2 - 1 = 1
Số số hạng của dãy số trên là:
(100 - 1) : 1 + 1 = 100 (số hạng)
A = (100 + 1) x 100 : 2 = 5050
B = 150 x 5050
B = 757500
12 tháng 2 2017
150x4+500
=600+500
=1100
Ai k mình 3 k k lại!
Giúp mình đi!
BT
23 tháng 6 2021
Question 2. If we _____ wasting water, there will be a shortage of freshwater in a few decades.
A. turn on
B. look for
C. look after
D. go on
Question 3. My best friend's birthday is _____ 16th September.
A. on
B. in
C. at
D. since
Question 4. Asian people eat rice. Rice _____ in many parts of Asia.
A. grown
B. is grown
C. have grown
D. has grown
Question 5. She didn't pass her exam _____ she studied lazily.
A. so
B. although
C. because
D. but
Question 6. Children shouldn't be allowed _____ time ______ computer games.
A. waste - to play
B. wasting - playing
C. to waste - to playing
D. to waste - playing
Question 7. Most people believe that school days are the _____ days of their life.
A. better
B. best
C. more best
D. good
Question 8. We _____ a big party for Debbie's birthday.
A. annoyed
B. arranged
C. arrived
D. appeared
Question 9. I think scientists should not be allowed to perform _____ on animals. It's cruel.
A. experiences
B. duties
C. experiments
D. miracles
Question 10. Jennifer was _____ when she realised that there was a hole in her pants.
A. embarrassed
B. depressed
C. confident
D. pleasant
Question 11. The roots take in nutrients and water from the _____.
A. soil
B. leaves
C. stem
D. flower
Question 12. What is a dinosaur?
A. a kind of animal that lives in nature today
B. a kind of animal that lives only in a zoo today
C. one kind of animal that lived 50 years ago
D. one kind of animal that lived millions of years ago
Question 13. Day and night are caused by _____.
A. Earth's spin
B. the way sunlight hits the Moon
C. the Sun's path around the Earth
D. the shape of the Earth
Question 14. Two friends are talking about their upcoming summer holiday.
Jack: "I'm going to take a five-day trip to Singapore."
Jill: "_____"
A. The same to you.
B. No, of course not.
C. You're welcome.
D. Oh, really? Have a great trip!
Question 15. The classmates are planning to take a field trip.
The monitor: "Why don’t we visit Hue Citadel this weekend?
Jean: "_____. We can learn about Vietnamese history."
A. No, thanks
B. No, let’s do that
C. OK, I don’t
D. That’s a good idea
Question 16. Jenny: "Congratulations on your winning the first prize at the talent contest!"
Tom: "______"
A. You’re welcome.
B. Not at all.
C. Yes, certainly.
D. That’s very kind of you
# Học tốt #
22 tháng 1 2017
150 . 150 . 150 =
22500 . 150 =
3375000
hoac
150 . 150 . 150 =
150^3 =
3375000
20 tháng 1 2017
x + 150 = 150 + 150
x + 150 = 300
x = 300 - 150
x = 150
SP
20 tháng 1 2017
x + 150 = 150 + 150
x + 150 = 300
x = 300 - 150
x = 150
tk mk mk tk lại
15x150+15x400+150=8400
tk nha
ai tk mk
mk tk lai
15x150+15x400+150
= 15x150+15x400+15x10
= 15x( 150+400+10)
=15x560
=8400
k nhé