1.2 2.9 3.7 7.7=?

K

Khách

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AM

Anh Mỹ Hạnh

4 tháng 8 2016

1.2+2.9+3.7+7.7=?

2

AM

Anh Mỹ Hạnh

4 tháng 8 2016

1.2+2.9+3.7+7.7=2.(1+9)+7.(3+7)

=2.10+7.10

=(2+7).10

=9.10

=90

NT

Nguyễn Trần Thành Đạt

4 tháng 8 2016

1.2+2.9+3.7+7.7

=2+18+21+49

=20+21+49

=41+49

=90

Những câu hỏi liên quan

LT

lê thị hiền

24 tháng 8 2016

a) 6.3+(-3.7)+2.4+(-0.3)

b)(-4.9)+5.5+4.9+(-5.5)

c)2.9 +3.7+(-4.2)+(-2.9)+4.2

d)(-6.5).2.8+2.8.(-3.5)

1

NN

no never

5 tháng 9 2016

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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">

CD

Cặp Đôi Bạn Thân

23 tháng 8 2016

a) 6.3+(-3.7)+2.4+(-0.3)

b)(-4.9)+5.5+4.9+(-5.5)

c)2.9 +3.7+(-4.2)+(-2.9)+4.2

d)(-6.5).2.8+2.8.(-3.5)

1

VT

Vĩnh Thụy

23 tháng 8 2016

a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

= 4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

ND

Nguyễn Đức Thanh

13 tháng 12 2021

Cho A=7.7^2.7^3.7^4. ... .7^29

Tìm số dư của A khi chia cho 8

cíu mình zới

1

ND

Nguyễn Đức Thanh

13 tháng 12 2021

nhầm, nhân thành cộng nhé mn

ND

nguyen do trung duc

8 tháng 11 2014

sau khi them vao so tru 3.7 va bot o so bi tru 2.9 thi hieu hai so la 15.4. Tim hieu ban dau

2

NT

Nguyen Thi Tra My

15 tháng 11 2016

hiệu ban đầu là: 15.4-(2.9+3.7)=8.8

NT

Nguyen Thi Tra My

17 tháng 11 2016

đúng đấy nhé tớ đã được cô giáo chữa cho rồi đó

DT

Đặng Thị Phương Dung

8 tháng 4 2017

nếu thêm vào số bé 3.7 và bớt số lớn 2.9 thì hiệu mới là 15.4 .tìm hiệu cũ của hai số đó.(có vẽ hình)

12

NL

Nhók_lạnh lùng

8 tháng 4 2017

Hiệu cũ của 2 số đó là :

15,4 + 3,7 + 2,9 = 22

Đáp số :22

NP

Nguyễn Phương Anh

8 tháng 4 2017

hiệu cũ là:

15,4+ 3,7+2,9=22

đáp số :22

LN

Long Nguyễn Thị

30 tháng 4 2015

Tìm x biết: x + 1/1.2 + 1/2.4 + 1/3.7+1/7.11+1/11.16=1

1

KB

Kẻ Bí Mật

30 tháng 4 2015

x = \(\frac{163}{528}\)

cho 1 đ-ú-n-g nha bạn

MA

Minz Ank

22 tháng 4 2021

1.Tính tổng: A = 1.2 + 3.4 +...+ 2(2n+1)(n+1)

2.Tính tổng: A = 1.3 + 3.7 + 5.11 +...+ 99.199

0

MM

mega man x and zero

18 tháng 3 2016

Do:Có những cặp phân số mà khi ta nhận chúng với nhau hoặc công chúng với nhau đều được cùng một kết quả.Chẳng hạn:Cặp phân số 7/3 va 7/4 co:7/3.7/4=7.7/3.4=49/12 7/3+7/4=7.4+7.3/12=49/12

0

NM

nguyễn minh châu

20 tháng 2 2018

Tìm x,biết x là số tự nhiên và (1.2+3.7)<x<(2.1+3.2)

1

H

haruka

27 tháng 4 2021

4,9<5<5,3