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a) 60 : (2 x 5) = 60 : 10 = 6
60 : 2 : 5 = 30 : 5 = 6
60 : 5 : 2 = 12 : 2 = 6
Vậy 60 : (2 x 5) = 60 : 2 : 5 = 60 : 5 : 2
b) (24 x 48) : 12 = 1 152 : 12 = 96
(24 : 12) x 48 = 2 x 48 = 96
24 x (48 : 12) = 24 x 4 = 96
Vậy (24 x 48) : 12 = (24 : 12) x 48 = 24 x (48 : 12)
24 x 55 + 12 x 88 + 24
= ( 24 x 55 ) + ( 12 x 88 ) + 24
= 1320 + 1056 + 24
= 2376 + 24
= 2400
_HT_
\(24\cdot55+12\cdot88+24\)
\(\Leftrightarrow\left(24\cdot55\right)+\left(24\cdot88:2\right)+24\)
\(\Rightarrow\left(24+55\right)+\left(24\cdot44\right)+24\)
\(\Leftrightarrow24\left(55+44+1\right)\)
\(\Leftrightarrow24\cdot100\)
\(\Leftrightarrow2400\)
\(\dfrac{6.8.15}{24.12.5}=\dfrac{6.4.2.5.3}{4.6.6.2.5}=\dfrac{1}{2}\)
a, 56 x 12 + 24 x 36 + 24 x36 = 56 x 12 + 12 x 2 x 36 + 12 x 2 x 36
= 56 x 12 + 12 x 72 + 12 x 72
= 12 x ( 56 + 72 + 72 )
= 12 x 200
= 2400
b, 2005 x 178 - 77 x 2005 - 2005 = 2005 x ( 178 - 77 - 1 )
= 2005 x 100
= 200500
**** mình nha nguyễn thùy trang
\(\dfrac{7}{12}< \dfrac{x}{24}< \dfrac{2}{3}\)
Ta có:
\(\dfrac{7}{12}=\dfrac{7x2}{12x2}=\dfrac{14}{24}\)\(;\dfrac{2}{3}=\dfrac{2x8}{3x8}=\dfrac{16}{24}\)
\(\Rightarrow x=15\)
\(\dfrac{7}{12}< \dfrac{x}{24}< \dfrac{2}{3}\)
\(\Rightarrow\dfrac{7\times2}{12\times2}< \dfrac{x}{24}< \dfrac{2\times8}{3\times8}\)
\(\Rightarrow\dfrac{14}{24}< \dfrac{x}{24}< \dfrac{16}{24}\)
\(\Rightarrow14< x< 16\)
x-24=12
x=12+24
x=36