Chủ đề / Chương

Bài học

Hãy tham gia nhóm Học sinh Hoc24OLM
Cặp Đôi Bạn Thân

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)
Lớp 7 Toán
Những câu hỏi liên quan
lê thị hiền

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)

Xem chi tiết
Lớp 7 Toán Câu hỏi của OLM

Khách
 
no never
5 tháng 9 2016 lúc 16:21

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Nguyễn Thị Thanh Nhàn

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

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

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Lớp 7 Toán Đại số lớp 7

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Đức Hiếu
20 tháng 6 2017 lúc 20:47

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

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6-1,3=4,7\)

b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)

\(=0+0=0\)

Chúc bạn học tốt!!!

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Shinichi Kudo
20 tháng 6 2017 lúc 20:56

a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7

b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0

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Quang Duy
20 tháng 6 2017 lúc 21:21

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

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6+\left(-1,3\right)=4,7\)

b)\(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(-5,5+5,5\right)\)

\(=0+0=0\)

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unicalia chile
2^2.4^4.2^6.2.22.2^3.2^7.2^43^2.33^4.3^3.33.3^5.3^4.3^23.3^6.3^7.3^44.4^34^5.4.4^74.4^3.4^5.4^65.5^65.5^45.5^2.5^45.5^3.5^4.5^65.5^6.5^4.5^3x.x^2x.x^3.x^5a.a^4a.a^2.a^4.a^5.a^7a.a^3.a^5.a^6a^4.a.a^5.a^6.ax.x^3.x^4x^5.x^4.x.x^7.x^67.7^27.7^2.7^4.7^57^3.7^5.7.7^47^2.7.7^6.7^6.7^310.10^210.10^210.100.10^310.100.10^4.100010^2.10^4.100.1000  
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Lớp 6 Toán Câu hỏi của OLM

Khách
 
unicalia chile
20 tháng 8 2019 lúc 10:07

làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người

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unicalia chile
20 tháng 8 2019 lúc 10:09

nhanh nha mọi người

T.T

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Rinu
20 tháng 8 2019 lúc 10:23

Bài làm

22.44.26.2.2=22.28.26.22=218

2.23.27.24=215

32.3=33=27

34.33.3=38

3.35.34.32=312

3.36.37.34=318

4.43=44

45.4.47=413

4.43.45.46=415

5.56=57

5.54=55

5.52.54=57

5.53.54.56=514

5.56.54.53=514

x.x2=x3

x.x3.x5=x9

a.a4=a5

a.a2.a4.a5.a7=a19

a.a3.a5.a6=a15

a.a4.a.a5.a6.a=a18

x.x3.x4=x8

x5.x4.x.x7.x6=x23

7.72=73

7.72.74.75=712

73.75.74.7=713

72.7.76.76.73=718

10.102=103

10.100.103=106

10.100.104.1000=1010

102.104.100.1000=1011

Tk nha !

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duan lexuan

tìm giá trị nhỏ nhất của biểu thức : B=|x+2.8|-3.5          C=3.7+|4.3-x|
 

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Lớp 7 Toán Câu hỏi của OLM

Khách
 
đỗ mai hạnh

các bạn giải nhanh hộ mình đc ko Tính:

A)5.4^15.9^9-4.9^10.8^9/6^19.4^5.5-7.2^29.27^6

B)2^10.4^5-9^2.4^6/3^5.8^4+2^6.6^6 - 25^5.7^3-49^2.25^3.625/14^3.5^9+(125.7)^3

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Lớp 7 Toán Câu hỏi của OLM

Khách
 
ThanhMoon

Mấy cậu giúp tớ với

1.Rút gọn: 2^5.7+2^6/ 2^5.5^2-2^5.7

2. So sánh: 3.7+6.21+9.28/ 4.9+8.27+12.36 và 49/84

3. Tìm X biết: 

a, (2x+14):2^2-3=1

b, 3^2x-5+2=29

Giải nhanh rồi tớ tick nhé

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Lớp 6 Toán Câu hỏi của OLM

Khách
 
nguyenquytuananh
25 tháng 5 2020 lúc 19:52

Đáp án 2^

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Quỳnh
25 tháng 5 2020 lúc 20:01

Bài làm

1. Rút gọn

 \(\frac{2^5.7+2^6}{2^5.5^2-2^5.7}=\frac{2^5\left(7+2\right)}{2^5\left(25-7\right)}=\frac{9}{18}=\frac{1}{2}\)

2. So sánh

Ta có: \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}\)

\(=\frac{14+126+252}{36+216+432}=\frac{392}{684}=\frac{98}{171}\)

Mà ta thấy, mẫu số của phân số 98/171 lớn hơn mẫu số của phân sốc 49/84 ( 171 > 84 )

=> \(\frac{98}{171}< \frac{49}{84}\)

Vậy \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}< \frac{49}{84}\)

3. Tìm x

a) ( 2x + 14 ) : 22 - 3 = 1

( 2x + 14 ) : 4 - 3 = 1

( 2x + 14 ) : 4 = 1 + 4

( 2x + 14 ) : 4 = 5

2x + 14 = 5 x 4

2x + 14 = 20

2x = 6

x = 3

Vậy x = 3

b) 32x - 5 + 2 = 29

9x - 5 + 2 = 29

9x - 5 = 27

9x = 32

x = 32 : 9 = \(\frac{32}{9}\)

Vậy x = \(\frac{32}{9}\)

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le xuan cuong

TIM GIA TRI NHO NHAT CUA BIEU THUC

A= 1.7 + I 3.4 -x I 

B= I x + 2.8 I -3.5

C= I 4.3 -x I + 3.7
 

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Lớp 7 Toán Câu hỏi của OLM

Khách
 
Bùi Khánh Thi
17 tháng 2 2017 lúc 15:34

\(A=1,7+\left|3,4-x\right|\)

\(C\text{ó};\left|3,4-x\right|\)lớn hơn or =0

\(\Rightarrow\)\(1,7+\left|3,4-x\right|=1,7+0\)

\(\Rightarrow1,7+\left|3,4-x\right|=1,7\)

\(\Rightarrow\left|3,4-x\right|=0\)

\(\Rightarrow x=3,4\)

\(B=\left|x+2,8\right|-3,5\)

\(C\text{ó}:\left|x+2,8\right|\)Lớn hơn or = 0

\(\Rightarrow\left|x+2,8\right|-3,5=0-3,5\)

\(\Rightarrow\left|x+2,8\right|-3,5=-3,5\)

\(\Rightarrow\left|x+2,8\right|=0\)

\(\Rightarrow x=-2,8\)

\(C=\left|4,3-x\right|+3,7\)

\(C\text{ó}:\left|4,3-x\right|\) Lớn hơn or = 0

\(\Rightarrow\left|4,3-x\right|+3,7=0+3,7\)

\(\Rightarrow\left|4,3-x\right|+3,7=3,7\)

\(\Rightarrow\left|4,3-x\right|=0\)

\(\Rightarrow x=4,3\)

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nguyễn tuấn hưng

Tính 

1.16^3÷8^2

2.8^3×(0.125)^3

3.7^200×(1/7)^200

4. (0.25)^3×64

5.5^4×20^4 phần 255×45

GIÚP MÌNH VỚI CÁC BẠN NHÉ

Các số đầu là các số thứ tự

 

 

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Lớp 7 Toán Câu hỏi của OLM

Khách
 
ᵛᶰシHắ¢ღHσàиɢღTнιêиღуυм...
18 tháng 8 2020 lúc 20:56

a) \(16^{^3}:8^2=\left(8.2\right)^3:8^2=8^3.2^3:8^2=\left(8^3:8^2\right).2^3=8.8=64\)

b)\(8^3.\left(0,125\right)^3=\left(8.0,125\right)^3=1^3=1\)

c)\(7^{^{200}}.\left(\frac{1}{7}\right)^{200}=\left(7.\frac{1}{7}\right)^{200}=1^{200}=1\)

d)\(4.\left(0,25\right)^3.64=4.\left(0,25\right)^3.4^3=4.\left(0,25.4\right)^3=4.1=4\)

e)....

cậu có thể tham khảo bài làm trên đây ạ, chúc cậu hok tốt ^^

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Anh Mỹ Hạnh

1.2+2.9+3.7+7.7=?

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Lớp 3 Toán Câu hỏi của OLM

Khách
 
Anh Mỹ Hạnh
4 tháng 8 2016 lúc 12:28

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

                          =2.10+7.10

                          =(2+7).10

                          =9.10

                          =90

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Nguyễn Trần Thành Đạt
4 tháng 8 2016 lúc 12:51

1.2+2.9+3.7+7.7

=2+18+21+49

=20+21+49

=41+49

=90

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