\(a,C1:\left(75+25\right):5=100:5=20\\ C2:\left(75+25\right):5=75:5+25:5=15+5=20\)

\(b,C1:\left(84-24\right):4=60:4=15\\ C2\left(84-24\right):4=84:4-24:4=21-6=15\)

\(c,C1:\left(123+456\right):3=579:3=193\\ C2:\left(123+456\right):3=123:3+456:3=41+152=193\)

\(d,C1:\left(936-306\right):6=630:6=105\\C2:\left(936-306\right) :6=936:6-306:6=156-51=105\)

a,(75 + 25) : 5
C1: 100 : 5 = 20
C2: 75 : 5 + 25 : 5 = 15 + 5 = 20
 

b,(84 - 24) : 4
C1: 60 : 4 = 15
C2: 84 : 4 - 24 : 4 = 21 - 6 = 15
 

c,(123 + 456) : 3
C1: 579 : 3 = 193
C2: 123 : 3 + 456 : 3 = 41 + 152 = 193

d,(936 - 306) : 6
C1: 630 : 6 = 105
C2: 936 : 6 - 306 : 6 = 156 - 51 = 105

a  (25 + 45) : 5 = 70 : 5 = 14

(45 + 25) : 5 = 45 : 5 + 25 : 5 = 9 + 5 = 14

 b  24 : 6 + 36 : 6 = 4 + 6 = 10

24 : 6 + 36 : 6 = (24 + 36) : 6 = 60 : 6 = 10

`a)`

`@C1:`

`(25+45):5=70:5=14`

`@C2:`

`(25+45):5=25:5+45:5=5+9=14`

`b)`

`@C1:`

`24:6+36:6=(21+36):6=60:6=10`

`24:6+36:6=4+6=10`

C1:a,(25 + 45) : 5

= 70 : 5

= 14

C2:

(45 + 25) : 5

= 45 : 5 + 25 : 5

= 9 + 5

= 14

 C1b,  24 : 6 + 36 : 6

         = 4 + 6

            = 10

C2:

24 : 6 + 36 : 6

= (24 + 36) : 6

= 60 : 6

= 10

35×6=210^^36×15=540^^24×35=840^^48×45=2160

a, 35 x6 =210

b,36x 15= 510

c, 24x15= 840

d, 48x 45=2160

CHÚC BẠN  HỌC TỐT

a, = 36.43-36.22+36.79 

=36(43-22+79) 

=36.100 

=3600 

a, = 36.43-36.22+36.79 

=36(43-22+79) 

=36.100 

=3600 

Mấy bạn trả lời thế kì. 6^2 ra 12 mới đúng chứ mấy bạn biến thành 36 là thế nào 😡😡

\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)

\(a)\)\(93\times8+93\times2\)

\(=98\times\left(8+2\right)\)

\(=98\times10\)

\(=980\)

\(b)36\times9+64\times9\)

\(=9\times\left(36+64\right)\)

\(=9\times100\)

\(=900\)

\(c)57\times8+57\times7\)

\(=57\times\left(8-7\right)\)

\(=57\times1\)

\(=57\)

`6/10=3/5`

`70/9=70/9`

`96/72=4/3`

`45/35=9/7`

`24/36=2/3`

`25/100=1/4`

$6/10=(6:2)/(10:2)=3/5$

$70/9$ ( tối giản)

$96/72=(96:24)/972:24)=4/3$

$45/35=(45:5)/(35:5)=9/7$

$24/36=(24:12)/(36:12)=2/3$

$25/100=(25:25)/(100:25)=1/4$

6p29s

7p15s

4p6s

giúp roài đó

C1:

a. 786 x ( 32 +68)

= 786 x  100

= 78600

b. 2904 x 15 + 2904 x 35

= 43560 + 101640

= 145200

c.436 x 72 - 436 x 42

= 31392 - 18312

= 13080

d.194 x (87-7)

= 194 x 80

=15520

e.3332 : (4x49)

= 3332 : 196

= 17

f. 72 : 9 : 8

= (72 : 9) :8

= 1

g. (15 x 24) : 6

= 360 :6

= 60

m. 25 x(36 :9)

= 25 x 4

= 100

Cách 2:

a.786 x 32 + 786 x 68

= 25152 + 53448

= 78600

b. 2904 x ( 15 + 35)

= 2904 x 50

= 145200

c.436 x (72 -42)

= 436 x 30

= 13080

d.194 x 87 - 194 x7

= 16878 - 1358

= 15520

e. 3332 : (4 x 49)

= 3332 : 4 : 49

= 833 : 49 = 17

f. 72 : 9 :8

= 72 : (9 x8)

= 72 : 72

=1

g. (15 x 24) :6 

= 15 x (24 :6)

= 15 x 4

= 60

m. 25 x (36 :9)

= ( 25 x36 ):9

= 900 : 9

=100

Tính thuận tiện:

a, 46 : 24 + 8 : 24

= (46 + 8) : 24

 = 54 : 24

= \(\dfrac{9}{4}\)

b, 705 : 45 - 336 : 45

    =  (705 - 336): 45

   =  369 : 45

   = \(\dfrac{41}{5}\)

c,   2345 : 12,5 : 8

  = 2345 : (12,5 x 8)

= 2345 : 100

= 2,345

d, 25 : 5,6 x 14

 = 25 : 0,8 : 7 x 7 x 2

= 25 : 0,8 x 2

= 50 : 0,8

= 62,5