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`x-10/3=7/18+3/5`
`=> x-10/3=89/90`
`=> x=89/90+10/3`
`=> x=389/90`
a) (12/25 + 13/25) + 3/5
= 25/25 + 3/5
= 25/25 + 15/25
= 40/25 = 8/5
b) 3/2 + ( 2/3 + 4/3)
= 3/2 + 1/3
= 15/6
c) ( 3/5 + 7/5) + 3/4
= 10/5 + 3/4
= 55/20 = 11/4
hok tot
nho k nhe
giải : ( ko chép lại đề ....... tự chép )
a) \(\frac{3}{5}\)+( \(\frac{12}{25}\) + \(\frac{13}{25}\))
= \(\frac{3}{5}\)+ 1
= \(\frac{8}{5}\)
b) \(\frac{3}{2}\)+ ( \(\frac{2}{3}\)+\(\frac{4}{3}\))
= \(\frac{3}{2}\)+ 2
= \(\frac{7}{2}\)
c) (\(\frac{3}{5}\)+ \(\frac{7}{5}\))+ \(\frac{3}{4}\)
= 2 + \(\frac{3}{4}\)
= \(\frac{11}{4}\)
hok tốt nha !!!
\(x\times\frac{3}{5}-\frac{1}{2}=\frac{4}{5}\)
\(\Rightarrow x\times\frac{6}{10}-\frac{5}{10}=\frac{4}{5}\)
\(\Rightarrow x\times\frac{1}{10}=\frac{4}{5}\)
\(\Rightarrow x=\frac{4}{5}:\frac{1}{10}\)
\(\Rightarrow x=\frac{4}{5}\cdot\frac{10}{1}\)
\(\Rightarrow x=\frac{40}{5}=8\)
Vậy x = 8
6: \(=\dfrac{9}{16}-\dfrac{1}{2}=\dfrac{1}{16}\)
8:
a: x=3/5:3=1/5
b: x=113*52=5876
\(x-\frac{6}{5}\div\frac{2}{3}=\frac{5}{6}\)
\(\Leftrightarrow x-\frac{18}{10}=\frac{5}{6}\)
\(\Leftrightarrow x=\frac{5}{6}+\frac{18}{10}\)
\(\Leftrightarrow x=\frac{25}{30}+\frac{54}{30}\)
\(\Leftrightarrow x=\frac{79}{30}\)
Ta có: x:7/8+3/4=7/4
-> x:7/8=7/4-3/4
->x:7/8=1
->x=1*7/8
->x=7/8
Vậy x=7/8
\(x\div\frac{7}{8}+\frac{3}{4}=\frac{7}{4}\)
\(\Rightarrow x\div\frac{7}{8}=\frac{7}{4}-\frac{3}{4}\)
\(\Rightarrow x\div\frac{7}{8}=1\)
\(\Rightarrow x=1\times\frac{7}{8}\)
\(\Rightarrow x=\frac{7}{8}\)