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5 tháng 9 2016 lúc 16:21

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Vĩnh Thụy
23 tháng 8 2016 lúc 19:32

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.

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đỗ mai hạnh
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ThanhMoon
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nguyenquytuananh
25 tháng 5 2020 lúc 19:52

Đáp án 2^

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 Khách vãng lai đã xóa
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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tạ Văn Khánh
Xem chi tiết
soyeon_Tiểubàng giải
27 tháng 9 2016 lúc 13:00
\(\frac{4^6.3^4.9^5}{6^{12}}=\frac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}=\frac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}=\frac{2^{12}.3^{14}}{2^{12}.3^{12}}=3^2=9\)​​\(\frac{3^{10}.11+9^5.5}{3^9.2^4}=\frac{3^{10}.11+\left(3^2\right)^5.5}{3^9.16}=\frac{3^{10}.11+3^{10}.5}{3^9.16}=\frac{3^{10}.\left(11+5\right)}{3^9.16}=\frac{3^{10}.16}{3^9.16}=3\)2100 - 299 - 298 - ... - 22 - 2

= 2100 - (299 + 298 + ... + 22 + 2)

Đặt A = 299 + 298 + ... + 22 + 2

2A = 2100 + 299 + ... + 23 + 22

2A - A = (2100 + 299 + ... + 23 + 22) - (299 + 298 + ... + 22 + 2)

A = 2100 - 2

Ta có:

2100 - 299 - 298 - ... - 22 - 2

= 2100 - (2100 - 2)

= 2100 - 2100 + 2

= 0 + 2

= 2

38 : 36 + (22)4 : 29

= 32 + 28 : 29

\(=9+\frac{1}{2}\)

\(=\frac{18}{2}+\frac{1}{2}=\frac{19}{2}\)

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unicalia chile
Xem chi tiết
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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Minh Anh Vũ
Xem chi tiết
Nguyễn Ngọc Lộc
28 tháng 6 2021 lúc 11:23

Ta có : \(C=\dfrac{4^6.3^4.9^5}{6^{12}}=\dfrac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}=\dfrac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}=3^{4+10-12}=3^2=9\)

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Nguyễn Lê Phước Thịnh
28 tháng 6 2021 lúc 11:42

\(C=\dfrac{4^6\cdot3^4\cdot9^5}{6^{12}}=\dfrac{2^{12}\cdot3^4\cdot3^{10}}{3^{12}\cdot2^{12}}=3^2=9\)

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\(C=\dfrac{4^6.3^4.9^5}{6^{12}}\) 

\(C=\dfrac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}\) 

\(C=\dfrac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}\) 

\(C=\dfrac{2^{12}.3^{14}}{2^{12}.3^{12}}\) 

\(C=3^2=9\)

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Nhok Khờ Dại
Xem chi tiết
KUDO SHINICHI
21 tháng 9 2016 lúc 15:02

\(\left(4096.81.729\right):2176782336\)

\(\left(331776.729\right):2176782336\)

\(\left(241864704\right):2176782336\)

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Sherlockichi Kazukosho
21 tháng 9 2016 lúc 15:02

\(\frac{4^6.3^4.9^3}{6^{12}}=\frac{2^{12}.3^4.3^6}{2^{12}.3^{12}}=\frac{2^{12}.3^{10}}{2^{12}.3^{12}}=\frac{1}{3^2}=\frac{1}{9}\)

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Phạm Nguyễn Hùng Nguyên
21 tháng 9 2016 lúc 15:05

=(2^12x3^10):2^12:3^12

=2^12:2^12x3^10:3^12

=3^(-2)

=1/9

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hbfbhdfchcjxcfdfs
Xem chi tiết
nguyễnminhphú
7 tháng 12 2018 lúc 22:09

=(x+x+x+........+x)+(0.1+0.2+0.3+.........+4.9)=44.2

                                                                                   / có 49x hay 50x nhe tự xem đi /

44.2 - ((4.9+0.1). k/c :2)=(x+x+x+..........+x)=?

lấy ? : (cái trong //)= x

can you k me

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