123-3.(x-5)=48
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a. \(x:3+27=48.2\)
\(\Leftrightarrow x:3+27=96\)
\(\Leftrightarrow x:3=96-27\)
\(\Leftrightarrow x:3=69\)
\(\Leftrightarrow x=69.3\)
\(\Leftrightarrow x=207\)
a) x : 3 + 27 = 48 x 2
x : 3 + 27 = 96
x : 3 = 96 - 27
x : 3 = 69
x = 69 x 3
x = 207
b)X x 5 : 7 = 123 -118
X x 5 : 7 = 5
X x 5 = 5 x 7
X x 5 = 35
x = 35 : 5
x = 7
https://hoc24.vn/cau-hoi/tim-x-bieta-x-12-15-b-123-5x438.3496371618478
a) 13.(23+22)-3.(17+28)
= 13.45 - 3.45
= 45(13-3)
= 45.10 =450
b) -48+48.(-78)+48(-21)
= -48 + 48(-78 - 21)
= -48 + 48.(-99)
= -48 + ( -4752)
= -4800
c) 135.(171-123)-171.(135-123)
= 135.171 - 135.123 - 171.135 + 171.123
= (135.171 - 171.135) - (135.123 - 171.123)
= - 123(135 - 171) = (-123).(-36)= 4428
a,\(\frac{5}{8}\times0=0\)
b.\(\frac{8}{21\times1}\)=\(\frac{8}{21}\)
32 x 48 + 48 x 6 - 123 : 3
= 48 x ( 32 + 6) - 123 : 3
= 48 x 38 - 41
= 1824 - 41
= 1783
1. \(\dfrac{-1}{7}-\dfrac{1}{8}=\dfrac{-8-7}{56}=\dfrac{-15}{56}.\)
2. \(\dfrac{15}{48}-\dfrac{5}{12}=\dfrac{5}{16}-\dfrac{5}{12}=-\dfrac{5}{48}.\)
3. \(\dfrac{-3}{15}-\left(\dfrac{-3}{25}\right)=\dfrac{-1}{5}+\dfrac{3}{25}=\dfrac{-2}{25}.\)
4. \(\dfrac{1}{15}-\dfrac{3}{5}=\dfrac{1-9}{15}=-\dfrac{8}{15}.\)
1. \(\dfrac{-1}{7}-\dfrac{1}{8}=\dfrac{-8-7}{56}=-\dfrac{15}{56}.\)
2. \(\dfrac{15}{48}-\dfrac{5}{12}=\dfrac{5}{16}-\dfrac{5}{12}=-\dfrac{5}{48}.\)
3. \(\dfrac{-3}{15}-\left(-\dfrac{3}{25}\right)=\dfrac{-1}{5}+\dfrac{3}{25}=-\dfrac{2}{25}.\)
4. \(\dfrac{1}{15}-\dfrac{3}{5}=\dfrac{1-9}{15}=-\dfrac{8}{15}.\)
https://www.youtube.com/channel/UCrvbojLGIWZot6_JUWWoMuw/featured
\(123-3\left(x-5\right)=48\)
\(3\left(x-5\right)=123-48=75\)
\(x-5=75:3=25\)
\(x=25+5=30\)
\(x=30\)