a, `12 + 126 + 42 + 74 + 158 + 88`

`= (12+88)+(126+74)+(42+158)`

`=100+200+200`

`=500`

b, `15xx23+15xx56+15xx21`

`=15xx(23+56+21)`

`=15xx100`

`=1500`

500

1500

bài này là tính nhanh nha

a) 428

b) 395

c) 98

d) 14

a= -77 x 113+45 x 23+77 x 158

a = -77 x 113 + 77 x 158 + 45 x 23

a = 77 x (-113 ) + 77 x 158 + 45 x 23

a = 77x [ (-113) + 158 ] + 45 x 23

a = 77 x 45 + 45 x 23

a = 45 x ( 77 + 23 )

a = 45 x 100

a = 4500

Hok tốt !

a=-77.113+45.23+77.158

a=77.(-113+158)+45.23

a=77.45+45.23

a=45.(77+23)

a=45.100

a=4500

Thank

 ( 764 - 759 ) + ( 368 - 369 ) 

= 5 - 5 = 10 

b) ( 4172 - 4168 ) - (1873 - 1869 ) 

= 4-4 = 0

a. (368-363) + ( 764-759) 

    = 5+5=10

b. ( 4172-4168)- ( 1873-1869)

   =4-4=0

c. [ 56. (35+18) ] :53

   = [ 56. 53] : 53

    = 2968 : 53

     = 56

d. Giong cau c do ban

\((x-17)+52=158\)

\(\Rightarrow x-17=158-52\)

\(\Rightarrow x-17=106\)

\(\Rightarrow x=106-17\)

\(\Rightarrow x=89\)

( x- 17 ) + 52 = 158

x - 17 = 158 - 52

x - 17 = 106

x = 106 + 7

x = 113

Vậy x = 113

( x : 23 + 45 ) : 67 = 8911

x : 23 + 45 = 8911 x 67

x : 23 + 45 = 597037

x : 23 = 597037 - 45 

x : 23 = 596992

x = 596992 x 23

x = 13730816

Vậy x = 13730876

(x-17)+52=158

x - 17 = 158 - 52

x - 17 = 106

x= 106+17

x= 123

(x :23 + 45):67=8911

(x : 68 ) : 67 = 8911

x : 68 = 8911 * 67

x : 68 = 597037

x= 597037 x 68

x = 40598516

k mình nhé !!!

x=-538

\(56.45+56.55\)

\(=56.\left(45+55\right)\)

\(=56.100\)

\(=5600\)

chuc bn hoc gioi!

nhae

= 5600

56 x 45 + 56 x 55 = 56 x 100

                           = 5600

a) 135 - ( x + 32 ) = 80

x + 32 = 135 - 80

x + 32 = 55

x = 55 - 32

x = 23

b)( x - 17 ) + 52 = 158

x - 17 = 158 - 52

x - 17 = 106

x = 106 + 17

x = 123

c x : 17 + 83 = 297

x : 17 = 297 - 83

x : 17 = 214

x = 214 x 17 

x = 3638

d) 9052: x - 56  = 17

9052 : x = 17 + 56

9052 : x = 73

x = 9052 : 73

x = \(\frac{1004}{17}\)

a)23

b)123

c)3638

d)1004/17

ai giúp với!!

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2 \(\times\) 3 \(\times\) 8 .... 45 - 5 \(\times\) 3

2 \(\times\) 3 \(\times\) 8 = 6 \(\times\) 8 = 48

\(45-5\times3\) = 45 - 15 = 30

Vì 48 > 40 nên 

2 \(\times\) 3 \(\times\) 8 > 45 - 5 \(\times\) 3

b, 46 + 56 .... 56 - 5 \(\times\) 3

   46 + 56 = 102

   56 - 5 \(\times\) 3 = 56 - 15 = 41

Vì 102 > 41  nên 

46 + 56  > 56 - 5 \(\times\) 6

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