\(8888+76\times36-38\times72=8888+76\times36-38\times2\times36=8888+76\times36-76\times36=8888+0=8888\)

8888

(:

dell

8888 x 85 + 10 x 8888 x 6 - 8888

= 8888 x (85+10-1) x 6

= 8888 x 94 x 6 = 5012832 mk nghĩ v á chứ còn muốn nhanh với thuận tiện nhất thì dùng máy tính là đc r (đùa thôi:))

`@` `\text {Ans}`

`\downarrow`

`69 \times 36 - 38 \times 18`

`= 69 \times 2 \times 18 - 38 \times 18`

`= 18 \times (69 \times 2 - 38)`

`= 18 \times (138 - 38)`

`= 18 \times 100`

`=1800`

=18(69*2-38)

=18*100=1800

36 x 5 + 72 x 2 - 216 + 144

= 252

\(36\text{×}5+72\text{×}2-216+144\)

\(=36\text{×}5+36\text{×}2\text{×}2-36\text{×}6+36\text{×}4\)

\(=36\text{×}5+36\text{×}4-36\text{×}6+36\text{×}4\)

\(=36\text{×}\left(5+4-6+4\right)=36\text{×}7=252\)

a)1996000

b)7200

1996 x 1001 - 1996      

=1996 x 1001 - 1996 x1

=1996 x(1001-1)=1996 x1000=1996000

.72 x 72 + 72 x 38 – 72 x10

=72 x (72+38-10)=72 x 100=7200

1996 x 1001 - 1996
= 1996 x (1001-1)
= 1996 x 1000
= 1996000

72 x 72 +72 x 38 - 72 x 10
= 72 x (72+38-10)
= 72 x 100
= 7200

ai nhanh mình tick nha!!!!!!!!

 8888 x 85 + 8888 x 10 + 8888 x 6 – 8888 

= 8888 x ( 85 + 10 + 6 - 1 )

= 8888 x 100

= 888800

=8888 x (85+10+6-1)

=8888 x 100

=888800

500 x 36 - 72 x 250+ 4150

=500 x 36 - 36 x 500 +4150

=0+4150

=4150

500 x 36 - 72 x 250+ 4150

= 500 x 36 - 36 x 500 +4150

= 0+4150

= 4150

a) (25x32) : 8           

= 25 x (4 x 8) : 8

= (25 x 4) x (8:8)

= 100 x 1

=100

b, 24 x 11 + 6 x 86 x 4 + 72

= 24 x 11 + (6 x 4) x 86 + 24 x 3

= 24 x 11 + 24 x 86 + 24 x 3

= 24 x (11+86+3)

= 24 x 100

= 2 400

\(\left(25\times32\right):8=25\times32:8=25\times\left(32:8\right)=25\times4=100\\ 24\times11+6\times86\times4+72\\ =24\times11+24\times86+24\times3\\ =24\times\left(11+86+3\right)\\ =24\times100=2400\\ 36\times5+9\times79\times4+72\times8\\ =36\times5+36\times79+36\times16\\ =36\times\left(5+79+16\right)\\ =36\times100=3600\\ \left(56\times125\right):7=56\times125:7=\left(56:7\right)\times125=8\times125=1000\)

38 x 6 + 38 x 3 + 38 

= 38 x (6+3+1)

= 38 x 10

= 380

38 x 6 + 38 x 3 +38= 38 x 6 + 38 x 3 +38 x 1

= 38 x (3 + 6 + 1)

= 38 x 10

=380

38 x 6 + 38 x 3 + 38

=38 x 6 + 38 x 3 + 38 x 1

=38 x( 6 + 3 + 1)

=38 x 10

=380