\(23\times45\times\left(45\times24-69\right)\times67\)

\(=23\times45\times\left(1080-69\right)\times67\)

\(=23\times45\times1011\times67\)

\(=1035\times1011\times67\)

\(=1046385\times67\)

\(=70107795\)

a,

=85.35-85.27-35.85+35.27

=85.35+85.(-27)-35.85+35.27

=85[35+(-27)+(-35)]+35.27

=85.(-27)+35.27

=-85.27+35.27

=27.[(-85)+35]

=27.(-50)

=-1350

các câu còn lại cũng vậy

a, 85 x ( 35- 27 ) - 35 x ( 35 - 27 )

85 x 8 - 35 x 8

8 x ( 85 - 35 ) 

8 x 50 = 400

b, ( -45 ) x 69 + 30 x ( -45 ) +( -45)

( -45 ) x ( 69 + 30 + 1)

-45 x 100 = -4500

c , 26 + 7 x ( 4 - 12 )

26 + 7 x ( - 8 )

26 + ( -56 )=(- 30)

d , 127 - 18 x ( 5 + 6 )

127 - 18 x 11

127 - 180 + 18

-53 + 18 = - 35

a.85x(35-27)-35x(85-27)

=85x8-35x58

=680-2030

=(-1350)

b.(-45)x69+30x(-45)+(-45)

=(-3105)+(-1350)+(-45)

=1800+(-45)

=1755

c.26+7x(4-12)

=26+7x(-8)

=26+(-56)

=(-30)

d.127-18x(5+6)

=127-18x11

=127-198

=(-71)

li-ke cho mình nha bạn

-69. | -45 | - 31 . | 45|

= -69 . 45 - 31 . 45

= 45 ( -69 - 31)

= 45. (-100)

= -4500

hok tốt!

-69 x |-45| -31.| 45|

= -69.45 - 31.45

= 45(-69 - 31)

= 45.(-100)

= -4500

    -69 x |-45| - 31 x |45|

= -69 x 45 - 31 x 45

= 45 x (-69 -31)

= 45 x (-100)

= -4500

~Đúng nhớ tk giúp mình nhé!! Thanks 😘

#Học_tốt

1;

31.(45+69)+69.(45-31)

=31.45+69.31+69.45-69.31

=45.(69+31)+(69.31-69.31)

=45.100+0

=4500

2;

A=2x+3y+9x+8y

=>A=x.(2+9)+y.(8+3)

=>A=11x+11y

=>A=11.(x+y)mà x+y =10

=>A=11.10

=>A=110

Bài 1 .

31 . ( 45 + 69 ) + 69 . ( 45 - 31 )

= 31 . 45 + 69 . 31 + 69 . 45 - 69 . 31

= 45 . ( 69 + 31 ) + ( 69 . 31 - 69 . 31 )

= 45 . 100 + 0

= 4500

Bài 2 .

Ta có : A = 2x + 3y + 9x + 8y

\(\Rightarrow\) A = x . ( 2 + 9 ) + y . ( 3 + 8)

\(\Rightarrow\) A = 11x + 11y . Mà x + y = 10 nên :

\(\Rightarrow\) A = 11 . 10

\(\Rightarrow\) A = 110

Vậy A = 110

Tính nhanh

31 . ( 45 + 69 ) + 69 . ( 45 - 31 ) = 0

a) 45 x 76 + 90 x 12

= 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x ( 76 + 24 ) 

= 45 x 100

= 4500

b) 2 x 31 x 12 + 4 x 6 x 69

= 24 x 31 + 24 x 69

= 24 x ( 31 + 69 )

= 24 x 100

= 2400

c) 36 x 28 + 36 x 82 + 64 x 69 + 64 x41

= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )

= 36 x 110 + 64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11 000

d) 156 ( x + 61)  = 82

=> x + 61 = \(\frac{82}{156}\)

=> x + 61 = \(\frac{41}{78}\)

=> x = \(\frac{41}{78}\)- 61

=> x = \(\frac{-4717}{78}\)

45 x 76 + 90 x 12 = 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x (76 + 24)

= 45 x 100 

= 4500

b) 2 x 31 x 12 + 4 x  6 x 69 = 62 x 12 + 2 x 12 x 69

= 62 x 12 + 138 x 12

= (62 + 138) x 12

= 200 x 12 = 2400

a, 45 x 76 + 90 x 12

= ( 45 x 12 ) + ( 76 x 90 )

=  540     +   6840

=     7 380

c,

= 36 x ( 28 + 82 ) +  64 x ( 69 + 41 )

= 36 x  110    +   64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11000

(-69)x|-45|-31x|45|

=(-69)x45-31x45

=45x[(-69)-31]

=45x(-100)

=-4500

\(\left(-69\right)\times\left|-45\right|-31\times\left|45\right|\)

\(=\left(-69\right)\times45-31\times45\)

\(=45\left(-69-31\right)\)

\(=45\times100\)

\(=4500\)

Tính nhanh :

a)8 x 45 + 55 x 8 

= 8x(45+55)

= 8x100

=800

28 x 69 + 31 x 28 

= 28x(69+31)

= 28x100

=2800

Ta có :

8 x 45 + 55 x 8 

= 8 x ( 45 + 55 )

= 8 x 100 

= 800

28 x 69 + 31 x 28 

= 28 x ( 69 + 31 )

= 28 x 100 

= 2800

mik tl trước mak 

\(x:2+250.4=55.61+69.55-45.37-93.45\)

\(\Leftrightarrow x:2+1000=55\left(61+69\right)-45\left(37+93\right)\)

\(\Leftrightarrow x:2+1000=55.130-45.130\)

\(\Leftrightarrow x:2+1000=130\left(55-45\right)\)

\(\Leftrightarrow x:2+1000=130.10\)

\(\Leftrightarrow x:2+1000=1300\)

\(\Leftrightarrow x:2=1300-1000=300\)

\(\Leftrightarrow x=300.2=600\)

Vậy \(x=600\)

X:2+250*4=55*61+69*55-45*37-93*45

X:2+250*4=(55*61+69*55)-(45*37+93*45)

X:2+1000=55*(61+69)-45*(37+93)

X:2+1000=55*130-45*130

X:2+1000=(55-45)*130

X:2+1000=10*130

X:2+1000=1300

X:2=1300-1000

X:2=300

X=300*2

X=600

Vậy X = 600

350 x 45 + 69

= 15750 + 69

= 15819

350 x 45 + 69

= 15750 + 69

= 15819

...

350 x 45 + 69 = 15819

các bạn k để nha