a, ( - 5 ) . ( - 7 ) . 4 . 20 . ( - 25 )

= -70000

 b, ( - 16 ) . 73 + ( - 16 ) . 27

= -1600

c, ( - 48 ) . 159 - ( - 48 ) . 59

= -4800

d , 72 . ( - 83 ) + ( - 72 ) . ( - 125 )

= 3014

e , ( - 81 ) . 125 - 181 . ( - 125 )

= 12500

#Hoctot

a -70000.0000 

b-1600.000000

c-4800.000000

d-4968.000000

e-12500.00000

a, 70000

b, 1600

c, 4800

d, 3014

e, 12500

a) (-370) + 114 + 236 + 370

= (-370 + 370) + 114 + 236

= 114 + 236

= 350

b, (-120) + (-130) + 360 + (-110)

= (-120 - 130 - 110) + 360

= -360 + 360

= 0

c, 25 + 37 - 48 - 25 - 37

= (25 - 25) + (37 - 37) - 48

= -48

d, (-125) - (19 - 125)

= -125 - 19 + 125

= (-125 + 125) - 19

= -19

e, 100 - [ 25 - (-19 - 11)]

= 100 - (25 + 19 + 11)

= 100 - (25 + 30)

= 100 - 55

= 45

f, 271 - [( -43) + 271 - (-17)]

= 271 - (-43 + 271 + 17)

= 271 + 43 - 271 + 17

= (271 - 271) + (43 + 17)

= 60

g, 35 . (-29) + (-29) . 65

= (-29)(35 + 65)

= (-29) . 100

= -2900

h, 2² . (-8) . (-25) . 125 . 18

= 4 . (-8) . (-25) . 125 . 18

= [4 . (-25)] . [(-8) . 125] . 18

= -100 . (-1000) . 18

= 100000 . 18

= 1800000

i, 48 : (-6 . 4 + 8)

= 48 : (-24 + 8)

= 48 : (-16)

= -3

j, -3 . 7 - 4 . (-5) + 1

= -21 + 20 + 1

= 0

k, 16 + (102 -7.6) - ( 94 . 17 - 27 . 94)

= 16 + (102 - 42) - 94(17 - 27)

= 16 + 102 - 42 - 94 . (-10)

= 16 + 102 - 42 + 940

= 16 + 60 + 940

= 16 + (60 + 940)

= 16 + 1000

= 1016

Chúc bn học tốt (Đây là cách của mình, mình nghĩ còn nhiều cách nữa, bạn có thể tham khảo bài mình)

48 × 19 + 48 × 115 + 134 × 52

= 48 × ( 19 + 115 ) + 134 × 52

= 48 × 134 + 134 × 52

= 134 × ( 48 + 52 )

= 134 × 100

= 13400

48 * 19 + 48 * 115 + 134 * 52

= 48 * ( 19 + 115 ) + 134 * 52 

=48* 134 + 134 * 52

= 134 * ( 48 + 52 ) 

= 134 x 100

= 13 400 

^^ Học tốt nha!

Mấy câu sau cứ lm tương tự zậy! :v  

48 x 19 + 48 x 115 + 134 x 52

= 48 x ( 19 + 115 ) + 134 x 52

= 48 x 134 + 134 x 52

= 134 x ( 48 + 52 )

= 134 x 100

= 134 00

5+ 5 + 5 + 5+ 5 + 5 +5+ 5 + 5 +5=5x10=50

25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200

45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240

5+ 5 + 5 + 5+ 5 + 5 +5+ 5 + 5 +5
= 5 x 10
= 50

25 + 25 + 25 + 25 + 25 + 25 +25 + 25
= 25 x 8
= 200

45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
= 45 x 4 + 15 x 4
= 180 + 60
= 240

2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18
= (2 + 18) + (4 + 16) + (8 + 12) + (6 + 14) + 10
= 20 + 20 + 20 + 20 + 10 
= 20 x 4 + 10
= 80 + 10
= 90 

125 + 125 + 125 + 125 - 25 - 25 - 25 - 25 
= 4 x (125 - 25) 
= 4 x 100 
= 400
(Tick cho mk pls ^^)

125,98- 125,48 = 0,5 - 52,25 = -51,75

\(125^{80}=\left(5^3\right)^{80}=5^{240}\)

\(25^{48}=\left(5^2\right)^{48}=5^{96}\)

Vì 240 > 96 mà 5 = 5

=> \(5^{240}>5^{96}\)

=> \(125^{80}>25^{48}\)

125⁸⁰  và 25⁴⁸

125⁸⁰=( 5³) ⁸⁰ =5²⁴⁰

25⁴⁸ = (5²)⁴⁸ =5⁹⁶

=>5²⁴⁰ >5⁹⁶=>125⁸⁰  > 25⁴⁸

Vì \(\hept{\begin{cases}125>25\\80>48\end{cases}\Rightarrow125^{80}>25^{48}}\)

\(\dfrac{31}{48}\times\dfrac{32}{93}\)

\(=\dfrac{31\times32}{48\times93}\)

\(=\dfrac{1\times2}{3\times3}\)

\(=\dfrac{2}{9}\)

============

\(\dfrac{77}{80}\times\dfrac{48}{49}\)

\(=\dfrac{77\times48}{80\times49}\)

\(=\dfrac{11\times3}{5\times7}\)

\(=\dfrac{33}{35}\)

=============

\(\dfrac{154}{125}\times\dfrac{25}{44}\)

\(=\dfrac{154}{125}\times\dfrac{25}{44}\)

\(=\dfrac{7\times1}{5\times2}\)

\(=\dfrac{7}{10}\)

\(a,125.\left(-4\right).\left(-16\right).25.8\\ =125.8.25.\left(-4\right).\left(-16\right)=1000.\left(-100\right).\left(-16\right)\\ =1000.1600\\ =1600000\\ b,16.\left(38+2\right)-38.\left(16-2\right)\\ =16.40-38.14\\ =640-532\\ =108\)

a,    125.(-4).(-16).25.8

=(125.8). { (-4).25} .(-16)

= 1 000.(-100).(-16)

= 1 600 000

b, 16. (38+2) - 38.( 16 - 2)

= 16.38 + 16.2 - 38.16 + 38.2

= 2.(16 + 38)

= 2. 54

= 108

`a,125xx(-4)xx(-16)xx25xx8`

`=(125.8)xx{ (-4).25}xx(-16)`

`=1000xx(-100)xx(-16)`

`=1600000`

`b,16.(38+2)-38xx( 16 - 2)`

`= 16xx38+16xx2-38xx16+38xx2`

`=2xx(16 + 38)`

`=2xx54`

`=108`

`@Nae`