Vận tốc dự định so với vận tốc thực tế là : 

            45/35 = 9/7

Vì cùng quãng đường nên thời gian và vận tốc là 2 đại lượng tỉ lệ nghịch.

Vậy thời gian theo dự định so với thời gian thực tế là : 7/9 

Hiệu số phần là: 9 - 7 = 2 (phần) 

Thời gian thực tế đi là : 30 : 2 x 9 = 135 (phút) = 2,25 giờ 

Quãng đường AB là : 35 x 2,25 = 78,75 (km) 

Vận tốc dự định so với vận tốc thực tế là :

            45/35 = 9/7

Vì cùng quãng đường nên thời gian và vận tốc là 2 đại lượng tỉ lệ nghịch.

Vậy thời gian theo dự định so với thời gian thực tế là : 7/9

Hiệu số phần là: 9 - 7 = 2 (phần)

Thời gian thực tế đi là : 30 : 2 x 9 = 135 (phút) = 2,25 giờ

Quãng đường AB là : 35 x 2,25 = 78,75 (km) 

a) \(5^{36}=\left(5^3\right)^{12}=125^{12}\) 

  \(11^{24}=\left(11^2\right)^{12}=121^{12}\)

b) \(625^5=\left(5^4\right)^5=5^{20}\)

     \(125^7=\left(5^3\right)^7=5^{21}\)

c) \(5^{23}=5^{22}.5\)

                   \(5^{22}.6\)

Còn lại bạn so sánh nhé

Theo bài ra , ta có : 

120ab : 376 = ab

120ab = 376 x ab

12000 + ab = 376 x ab

12000 + ab = ab + ab x 376

12000 + ab = ab x 1 + ab x 376

12000 + ab = ab x 375

=> ab = 12000 : 375

=> ab = 32

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gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg

fd

fg

g

g

g

g

g

g

g

g

g

g

g

g

g

yh

u

yt

tu

yt

eawr

we

r

tt

ryh

fyu

gfykhj

k

j

lhj

gi8

et

e

rsdth

dfyg

hndf

jfh

frghy

fg

h

f

j

fh

f

g

d

gf

h

fh

dhfg

dfhf

tr;dg

dg

g

fh

g

hg

g

gh

gg

h

hg

hg

h

t

t

t

t

t

sd

d

xdf

ghf

j

ghu

i

tfr

cxf

j

udse5ytr

77es

5

65

6

t

frf

g

c

g

tr

yt

f

v

g

v

tf

,

tfv

j

f

b

t

b

hy

n

gh

g

g

g

g

gf

41

4

4

2

42

24

24

24

24

24

2

5

2

24

44

2

45

452

2

12

2

2

22

4

1

24

4

4

5

42

4

14

2

42

24

25

4

4

44

5

tyhyf

tghy

f

h

fgh

dg

hg

fj

gh

k

jj

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

Số nhỏ nhất là :

  ( 3150 - 2 ) : 2 = 1574

Số lớn nhất là :

  3150 - 1574 = 1576

Số thứ hai là :

  1576 - 1 = 1575 

 Đáp số : Số nhỏ nhất : 1574

               Số thứ hai : 1575

               Số thứ ba : 1576

Quy đồng tử số , ta có :

   \(\frac{1}{4}=\frac{1.2}{4.2}=\frac{2}{8}\)

Ta có sơ đồ :

Tuổi mẹ : l------l------l------l------l------l  30

Tuổi bố :  l------l------l------l------l------l------l------l------l

Theo sơ đồ , hiệu số phần bằng nhau là :

     8 - 5 = 3 ( phần )

Tuổi của mẹ là :

 30 : 3 x 5 = 50 ( tuổi )

Tuổi của ba là :

 50 + 30 = 80 ( tuổi )

 Đáp số : ...

23 x 2 = 46

56 - 6 = 50

12 + 34 = 46

54 : 2 = 27

Tại sao lại phải lấy \(\frac{a+b+c}{2}\)\(mik\)\(k\)\(hỉu\)