`2022 \times 123 \times 12 - 2022 \times 11`

`= 2022 \times (123 \times 12 - 11)`

`= 2022 \times (1476 - 11)`

`= 2022 \times 1465`

`= 2962230`

 21,37 x 27,5 + 72,4 x 21,37 + 2,137 = 21,37 x (27,5 + 72,4) + 21,37 x 0,1 = 21,37 x ( 99,9 + 0,1) = 21,37 x 100 = 2137

21,37 x 27,5 + 72,4 x21,37 + 2,137

= 21,37 x (27,5 x 72,4) + 2,137

= 21,37 x 99,9 + 2,137

= 2137

học tốt nha

#Kí tên

Bảo Yêu Nhung

$#Shả$

`A)=5/17xx(15/34+19/34)`

`=5/17xx1=5/17`

`B)=(13/12+7/12)+1/3`

`=5/3+1/3=2`

1/2\(\times\)4+50%\(\times\)5+0.5

=2+2.5+0.5

=4.5+0.5

=5

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

a)67/63 x 15/3 + 15/31 x 11/21

Thiếu đề

b)15/31 x 34/63 - 11/21 x 15/31

=15/31 x ( 34/63 -11/21)

= 15/31 x  1/63=  5/651

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: 

(36 × 27) : 3 = 36 × (27 : 3)

= 36 × 9

= 324

--------

(125 × 15) : 5

= 125 × (15 : 5)

= 125 × 3

= 375

--------

(15 × 12) : 9

= (5 × 3 × 12) : 9

= 5 × (36 : 9)

= 5 × 4

= 20

--------

450 : (3 × 5)

= 450 : 15

= 30

--------

(45 × 63) : 9

= 45 × (63 : 9)

= 45 × 7

= 40 × 7 + 5 × 7

= 280 + 35

= 315

a: \(\dfrac{\left(36\cdot27\right)}{3}=36\cdot\dfrac{27}{3}=36\cdot9=324\)

b: \(\dfrac{\left(125\cdot15\right)}{5}=125\cdot\dfrac{15}{5}=125\cdot3=375\)

c: \(\dfrac{\left(15\cdot12\right)}{9}=\dfrac{3\cdot3\cdot4\cdot5}{9}=4\cdot5=20\)

d: \(\dfrac{450}{3\cdot5}=\dfrac{450}{15}=30\)

e: \(\dfrac{45\cdot63}{9}=\dfrac{45}{9}\cdot63=63\cdot5=315\)

45 x 38 + 45 x 63 - 45

=45 x 38 + 45 x 63 -45 x 1

=45 x (38+63-1)

=45 x 100

=4500

45x38+45x63-45

=45x(38+63-1)

=45x100

=4500

\(45.38+45.63-45\)

\(=45.38+45.63-45.1\)

\(=45\left(38+63-1\right)\)

\(=45.100=4500\)

Chúc bạn học tốt

TL:

=2,8×1,25+1,25×7,2=1,25×(2,8+7,2)=1,25×10=12,5

_HT_