tham khảo

a) (33164 + 28528) : 4 = 

Cách 1: (33164 + 28528) : 4

= 61692 : 4

= 15423

Cách 2: (33164 + 28528) : 4

= 33164 : 4 + 28528 : 4

= 8291 + 7132

= 15423

b) (403494 - 16415) : 7 =

Cách 1: (403494 - 16415) : 7

= 387079 : 7

= 55297 Cách 2: (403494 - 16415) : 7

= 403494 : 7 - 16415 : 7

= 57642 - 2345

= 55297

Cách 1:

a)\(\left(33164+28528\right):4=15423\)

b)\(\left(403494-16415\right):7=55297\)

Cách 2:

a)\(\left(33164+28528\right):4=33164:4+28528:4=8291+7132=15423\)

b)\(\left(403494-16415\right):7=403494:7-16415:7=57642-2345=55297\)

a: =25x10=250

b: =34x6=204

a =25 x 10=250

b =34x(11-5)=34x6=204

a. 25 x 10 =250

 C2: 25 x4 + 25 x 6 = 250

b. 374 - 170 =204

 C2 : 34 x ( 11 -5 ) = 34 x 6 = 204

Ở phần a dấu gì ở giữa vậy

a:\(=\left(\dfrac{3}{4}+\dfrac{2}{4}\right):\dfrac{3}{5}=\dfrac{5}{4}\cdot\dfrac{5}{3}=\dfrac{25}{12}\)

b: \(=\left(\dfrac{5}{6}-\dfrac{3}{6}\right):\dfrac{3}{2}=\dfrac{1}{3}\cdot\dfrac{2}{3}=\dfrac{2}{9}\)

a,C1 
 (5/6 + 5/8) x 2/3
= 35/24 x 2/3
=35/36
C2
 (5/6 + 5/8) x 2/3
= 5/6x2/3 + 5/8x2/3
= 10/18 + 10/24
= 35/36

b,C1
7/5 x 3/4 - 1/2 x 3/4
= 21/20 - 3/8
= 27/40
C2
7/5 x 3/4 - 1/2 x 3/4
=3/4 x (7/5-1/2)
=3/4x9/10
=27/40

a, 5/6 x (1/8x2/3) 

=5/6 x 1/12

=5/72

b,(7/5 - 1/2) x 3/4 

=0,9 x 3/4

=3,06

c,(5/6+5/8) x 2/3

=70/48 x 2/3

=35/36

a, 5/6 x (1/8x2/3) 

=5/6 x 1/12

=5/72

b,(7/5 - 1/2) x 3/4 

=0,9 x 3/4

=3,06

c,(5/6+5/8) x 2/3

=70/48 x 2/3

=35/36

a: =5/48+10/18=95/144

b: =3/4(7/5-1/2)=3/4x9/10=27/40

c: =2/3x35/24=70/72=35/36

a) c1 : = 142 x 9 + 142 x 1 

= 142 x ( 9 + 1 )

= 142 x 10

= 1420

c2 : = 142 x 9 + 142

= 1278 + 142 

= 1420

Cách 1: 142 x 9 + 124 = 1278 + 124 = 1420
Cách 2: 142 x 9 + 124 = 142 x 9 + 142 x 1 = 142 x ( 9 + 1 ) = 142 x 10 = 1420

21 nha