=???

ok chị

cái nịt

Ta có:

67 - [ 8 + 7 . 3² - 24 : 6 + ( 9 - 7 )³ ] : 15 

= 67 - (8 + 7.9 - 4 + 8) : 15

= 67 - 75 : 15

= 67 - 5

= 62

`a,`

`31/23-(7/32+8/23)`

`=31/23-7/32-8/23`

`=(31/23-8/23)-7/32`

`=1-7/32=25/32`

`b,`

`38/45-(8/45-17/51-3/11)`

`=38/45-8/45+17/51+3/11`

`= (38/45-8/45)+17/51+3/11`

`=2/3+17/51+3/11`

`=1+3/11=14/11`

`c,`

`(1/3+12/67+13/41)-(79/67-28/41)`

`= 1/3+12/67+13/41-79/67+28/41`

`= 1/3+(12/67-79/67)+(13/41+28/41)`

`= 1/3+(-1)+1=1/3+(-1+1)=1/3+0=1/3`

`d,`

`1/5+(-1/6)+1/7+(-1/8)+1/9+1/8+(-1/7)+1/6+(-1/5)`

`= (1/5+ -1/5)+(-1/6+1/6)+(1/7+ -1/7)+(-1/8 +1/8)+1/9`

`= 0+0+0+0+1/9=1/9 .`

\(67-\left[8+7.3^2-24:6+\left(9-7\right)^3\right]:15\\ =67-\left[8+7.9-4+2^3\right]:15\\ =67-\left[8+63-4+8\right]:15\\ =67-75:15\\ =67-5=62\)

cảm ơn bạn Nguyễn Hòang tùng nhé

Chọn A

A

nhanh đang cần gấp

\(\frac{5}{67}\)nhé

Tính nhanh : 

52 . (-67) - 52 . (-43) + 24 . (-48)

= 52 . [ (-67) - ( -43)  ] + 24 . (-48)

= 52 . (-24) + 24 . (-48)

= (-52) . 24 + 24 . (-48)

= 24 . [ (-52) + (-48) ]

= 24 . (-100)

= - 2400

(-12) . 7 + (-8) . 7 + 4 . (-25) + (-6) . (-25)

= 7 . [ (-12) + (-8) ] + (-100 ) + (-6) . (-25)

= 7 . (-20) - 100 + (-6) . (-25)

= (-140) - 100 + 150

= (-240) + 150

= -90