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a) 580 : ( x - 24 ) = 329 - 150 . 21
=> 580 : ( x - 24 ) = 329 - 150 . 2
=> 580 : ( x - 24 ) = 329 - 300
=> 580 : ( x - 24 ) = 29
=> x - 24 = 20
=> x = 20 + 24
=> x = 44
Vậy x = 44
mk nha các bạn !!!
=> 580 : ( x - 24 ) = 329 - 150 . 2
=> 580 : ( x - 24 ) = 329 - 300
=> 580 : ( x - 24 ) = 29
=> x - 24 = 20
=> x = 20 + 24
=> x = 44
Vậy x = 44
( -27 - 15 ) : ( -6 ) + (-4 )
= -42 : 6 + 4
= -7 + 4
= -3
( -3 + 9 ) . ( -7 ) : ( -14 ) + ( -12 )
= 6 . 7 : ( -14 ) + ( -12 )
= 42 : ( -14 ) + ( -12 )
= -3 + ( -12 )
= -15
Hai câu cuối tự làm nha ! Mik mới làm mẫu hai cái cho đó
d . 15 . ( 25 - 35 ) + 35 . ( 15 - 25 )
= 15. 25 - 15. 35 + 35. 15 - 35.25
= 15. 25 - 35.25
= 25. ( 35 - 25 )
= 25 . 10
= 250
a: \(\Leftrightarrow-4< x< -\dfrac{3}{10}\)
mà x là số nguyên
nên \(x\in\left\{-3;-2;-1\right\}\)
b: \(\Leftrightarrow-\dfrac{125}{27}< x< \dfrac{4}{7}\)
mà x là số nguyên
nên \(x\in\left\{-4;-3;-2;-1;0\right\}\)
a) \(\frac{18}{45}-\frac{4}{12}-\frac{6}{9}-\frac{21}{35}=\frac{2}{5}-\frac{1}{3}-\frac{2}{3}-\frac{3}{5}\)
\(=\left(\frac{2}{5}-\frac{3}{5}\right)-\left(\frac{1}{3}+\frac{2}{3}\right)\)
\(=\frac{-1}{3}-1\)
\(=\frac{-4}{3}\)
b) \(\frac{4}{3}+\frac{3}{5}+\frac{7}{3}+\frac{2}{5}+\frac{1}{3}=\left(\frac{4}{3}+\frac{7}{3}+\frac{1}{3}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)
\(=4+1=5\)
c) \(\frac{1}{3}.\frac{4}{5}.\frac{1}{3}.\frac{6}{5}=\frac{8}{75}\)
d) \(\frac{6}{7}.\frac{8}{13}+\frac{6}{7}.\frac{9}{13}-\frac{3}{13}.\frac{6}{7}\)
\(=\frac{6}{7}.\left(\frac{8}{13}+\frac{9}{13}-\frac{3}{13}\right)\)
\(=\frac{6}{7}.\frac{14}{13}\)
\(=\frac{12}{13}\)
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
7 . ( x - 14 ) + 35 = 25 + 297 : 9
7 . ( x - 14 ) + 35 = 25 + 33
7 . ( x - 14 ) + 35 = 58
7 . ( x - 14 ) = 58 - 35
7 . ( x - 14 ) = 23
x - 14 = 23 : 7
x - 14 = \(\frac{23}{7}\)
x = \(\frac{23}{7}+14\)
x = \(\frac{121}{7}\)