( 5/2 + 1/3) : ( 1 - 2/3)
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HT
2
24 tháng 6 2023
`@` `\text {Ans}`
`\downarrow`
`1/3+6/9+4/5+5/25`
`= 1/3+2/3+4/5+1/5`
`= 1+1`
`= 2`
`4/7*2/5+4/7*3/5-1/7`
`= 4/7*(2/5+3/5)-1/7`
`= 4/7*1-1/7`
`= 4/7-1/7=3/7`
24 tháng 6 2023
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4 tháng 5 2019
A, \(2\frac{2}{5}\left(\frac{1}{2}x-0,75\right)=\frac{3}{10}\)
\(=>\frac{2.5+2}{5}\left(\frac{1}{2}x-\frac{3}{4}\right)=\frac{3}{10}\)
\(=>\frac{1}{2}x-\frac{3}{4}=\frac{3}{10}:\frac{12}{5}=\frac{1}{8}\)
\(=>x=\left(\frac{1}{8}+\frac{3}{4}\right):\frac{1}{2}\)
\(=>x=\frac{7}{4}\)
B, \(\frac{3}{5}-|x-\frac{1}{2}|=25\%\)
\(=>|x-\frac{1}{2}|=\frac{3}{5}-\frac{1}{4}\)
\(=>|x-\frac{1}{2}|=\frac{7}{20}\)
\(=>x-\frac{1}{2}=\frac{7}{20};-\frac{7}{20}\)
TH1: \(x-\frac{1}{2}=\frac{7}{20}=>x=\frac{17}{20}\)
TH2: \(x-\frac{1}{2}=-\frac{7}{20}=>x=\frac{3}{20}\)
8 tháng 8 2019
\(C=5\frac{9}{10}:\frac{3}{2}-\left(2\frac{1}{3}.4\frac{1}{2}-2.2\frac{1}{3}\right):\frac{7}{4}\)
\(=\frac{59}{10}:\frac{3}{2}-\left(\frac{7}{3}.\frac{9}{2}-2.\frac{7}{3}\right):\frac{7}{4}\)
\(=\frac{59}{15}-\left[\frac{7}{3}\left(\frac{9}{2}-2\right)\right]:\frac{7}{4}\)
\(=\frac{59}{15}-\frac{35}{6}:\frac{7}{4}\)
\(=\frac{59}{15}-\frac{10}{3}\)
\(=\frac{9}{15}=\frac{3}{5}\)
\(\cdot62,87+35,14+4,13+8,35+4,86+5,65\)
\(=\left(62,87+4,13\right)+\left(35,14+4,86\right)+\left(8,35+5,65\right)\)
\(=67+40+14\)
\(=121\)
25 tháng 11 2021
1.
a) 8,4
b) 0,0245
2.
\(\dfrac{3}{5}+\dfrac{1}{2}+\dfrac{3}{10}\)\(=\dfrac{6}{10}+\dfrac{5}{10}+\dfrac{3}{10}\)
\(=\dfrac{6+5+3}{10}\)
\(=\dfrac{14}{10}=...\)
LB
2 tháng 5 2022
a)2/5+3/4
=23/20
b)2/5 + 3/10-1/2
=7/10-1/2
=1/5
c)8/11+8/33x3/4
=8/11 + 2/11
=10/11
tick cho mik nha mik cháy đen túi r
hok tốt
3 tháng 2 2021
2\(\frac{1}{3}\) giờ = 140 phút
3\(\frac{1}{5}\) phút= 192 giây
15 tháng 9 2018
a. \(3-\frac{2}{2x-1}=\frac{2}{3}+\frac{2}{6x-3}-\frac{3}{2}\)
\(3+\frac{3}{2}-\frac{2}{3}=\frac{2}{6x-3}+\frac{2}{2x-1}\)
\(\frac{23}{6}=\frac{2}{6x-3}+\frac{6}{6x-3}\)
\(\frac{23}{6}=\frac{8}{6x-3}\)\(\Rightarrow23.\left(6x-3\right)=48\)
\(6x-3=\frac{48}{23}\)
\(6x=\frac{48}{23}+3=\frac{117}{23}\)
\(x=\frac{117}{23}:6=\frac{117}{23}.\frac{1}{6}=\frac{39}{46}\)
b . \(\frac{1}{2x+3}+\frac{-2}{3}.\left(\frac{3}{4}-\frac{6}{5}\right)=\frac{5}{4x+6}\)
\(\frac{1}{2x+3}+\frac{-2}{3}.\frac{-9}{20}=\frac{5}{4x+6}\)
\(\frac{1}{2x+3}+\frac{3}{10}=\frac{5}{4x+6}\)
\(\frac{3}{10}=\frac{5}{4x+6}-\frac{1}{2x+3}\)\(=\frac{5}{4x+6}-\frac{2}{4x+6}\)
\(\frac{3}{10}=\frac{3}{4x+6}\)\(\Rightarrow3.\left(4x+6\right)=30\)
\(4x+6=30:3=10\)
\(4x=10-6=4\)
\(x=4:4=1\)
\(\left(\dfrac{5}{2}+\dfrac{1}{3}\right):\left(1-\dfrac{2}{3}\right)\)
\(=\left(\dfrac{15}{6}+\dfrac{2}{6}\right):\left(\dfrac{3}{3}-\dfrac{2}{3}\right)\)
\(=\dfrac{17}{6}:\dfrac{1}{3}\)
\(=\dfrac{17}{6}\times3\)
\(=\dfrac{17}{2}\)
Chúc bạn học tốt
\(\left(\dfrac{5}{2}+\dfrac{1}{3}\right):\left(1-\dfrac{2}{3}\right)\\ =\left(\dfrac{15}{6}+\dfrac{2}{6}\right):\left(\dfrac{3}{3}-\dfrac{2}{3}\right)\\ =\dfrac{17}{6}:\dfrac{1}{3}\\ =\dfrac{17}{6}\cdot3\\ =\dfrac{51}{6}\)