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A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=1+2\)
\(=3\)
\(\dfrac{5}{8}\) x 4 + \(\dfrac{5}{8}\) x \(\dfrac{4}{5}\)
= \(\dfrac{5}{8}\) x (\(4\) + \(\dfrac{4}{5}\) )
= \(\dfrac{5}{8}\) x \(\dfrac{24}{5}\) = 3
\(x-\frac{1}{4}=\frac{3}{5}\)
\(x=\frac{3}{5}+\frac{1}{4}\)
\(x=\frac{12}{20}+\frac{5}{20}\)
\(x=\frac{17}{20}\)
\(x:\frac{2}{3}=\frac{1}{2}\)
\(x=\frac{1}{2}.\frac{2}{3}\)
\(x=\frac{1}{3}\)
Hok tốt
\(x-\frac{1}{4}=\frac{3}{5}\)
\(x\) \(=\frac{3}{5}+\frac{1}{4}\)
\(x\) \(=\frac{12}{20}+\frac{5}{20}\)
\(x\) \(=\frac{17}{20}\)
\(x:\frac{2}{3}=\frac{1}{2}\)
\(x\) \(=\frac{1}{2}x\frac{2}{3}\)
\(x\) \(=\frac{2}{6}\)rút gọn \(\frac{1}{3}\)
1) \(=\left(\frac{3}{5}+\frac{2}{5}\right).\frac{6}{11}\)
\(=1.\frac{6}{11}\)
\(=\frac{6}{11}\)
2)\(\frac{17}{25}.\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\)
\(=\frac{17}{25}.1\)
\(=\frac{17}{25}\)
\(\frac{5}{11}.\frac{7}{25}+\frac{15}{11}.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.3.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.\frac{3}{5}\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{15}{25}\right)\)
\(=\frac{5}{11}.\frac{22}{25}=\frac{2}{5}\)
1200-31/40=47969/40
câu 2 =45/56+25/56=(45+25)/56=70/56=5/4
(995 x 37 + 1000) : (39 x 995 - 990)
= (36815 + 1000) : (38805 - 990)
= 37815 : 37815
= 1
(995 x 37 + 1000 ) : ( 39 x 995 - 990)
= ( 36815 + 1000) : ( 38805 - 990 )
= 37815 : 37815
=1
C1:
`5/8 xx (1/5 +2)`
`=5/8 xx (1/5 +10/5)`
`=5/8 xx 11/5`
`=11/8`
C2:
`5/8 xx (1/5 +2)`
`=5/8 xx 1/5 + 5/8 xx 2`
`=1/8 + 10/8`
`=11/8`
thank you