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-5/8 . 5/12 + -5/8 .7/12 + 17/8=(-5/8 + -5/8).(5/12 + 7/12).17/8 = 0 . 1 .17/8 = 0 .17/8 = 0
a) \(\left(-0,75+\frac{1}{2}\right):\frac{4}{3}\)
\(=\frac{-1}{4}:\frac{4}{3}\)
\(=\frac{-3}{16}\)
b) \(\frac{5}{9}.\frac{2}{7}+\frac{5}{9}.\frac{5}{7}-\frac{8}{3}\)
\(=\frac{5}{9}.\left(\frac{2}{7}+\frac{5}{7}\right)-\frac{8}{3}\)
\(=\frac{5}{9}.1-\frac{8}{3}\)
\(=\frac{-19}{9}\)
c) \(7,5.1\frac{3}{4}-6\frac{2}{5}\)
\(=\frac{15}{2}.\frac{7}{4}-\frac{32}{5}\)
\(=\frac{269}{40}\)
a, 3 \(\frac{14}{19}\)+ \(\frac{13}{17}\)+ \(\frac{35}{43}\)+ 6\(\frac{5}{19}\)+ \(\frac{8}{43}\)= \(\left(3\frac{14}{19}+6\frac{5}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)+\frac{13}{17}=\)\(9+1+\frac{13}{17}=8+\frac{13}{17}=8\frac{13}{17}\)
b, \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1\frac{5}{7}\)\(=\frac{-5}{7}\left(\frac{2}{11}+\frac{9}{11}\right)+1\frac{5}{7}\)\(=\frac{-5}{7}.1+1\frac{5}{7}\)\(=\frac{-5}{7}+\frac{12}{7}=\frac{7}{7}=1\)
Chúc bn học tốt
\(3\frac{14}{19}+\frac{13}{17}+\frac{35}{43}+6\frac{5}{19}+\frac{8}{43}\)
\(=\left(3\frac{14}{19}+6\frac{5}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)+\frac{13}{17}\)
\(=10+1+\frac{13}{17}=11+\frac{13}{17}=11\frac{13}{17}\)
a) \(\frac{-5}{8}\cdot\left(\frac{4}{9}+\frac{-7}{12}\right)\)
\(=\frac{-5}{8}\cdot\frac{-5}{36}\)
\(=\frac{25}{288}\)
b) \(\left(-3,2\right)\cdot\frac{-15}{64}+\left(0,8-2\frac{4}{5}\right):3\frac{1}{2}\)
\(=\frac{3}{4}+\left(-2\right):\frac{7}{2}\)
\(=\frac{3}{4}+\frac{-4}{7}\)
\(=\frac{5}{28}\)
=))
- (1/2-1/3-1/6).(3/8+34/88-345/888)
= (3/6-2/6-1/6).(3/8+34/88-345/888)
= 0.(3/8+434/88-345/888)=0
2. 8/3.2/5.3/8.10.19/92
= (8/3.3/8).(2/5.10).19/92
= 1.4.19/92
= 76/92
1) \(\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\left(\frac{3}{8}+\frac{34}{88}+\frac{345}{888}\right)=\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\left(\frac{3}{8}+\frac{34}{88}+\frac{345}{888}\right)\)
\(=\left(\frac{1}{6}-\frac{1}{6}\right)\left(\frac{3}{8}+\frac{34}{88}+\frac{345}{888}\right)\)
\(=0\cdot\left(\frac{3}{8}+\frac{34}{88}+\frac{345}{888}\right)=0\)(số nào nhân với 0 cũng bằng 0)
2) \(\frac{8}{3}\cdot\frac{2}{5}\cdot\frac{3}{8}\cdot10\cdot\frac{19}{92}=\frac{8\cdot2\cdot3\cdot10\cdot19}{3\cdot5\cdot8\cdot92}\)
\(=\frac{2\cdot10\cdot19}{5\cdot92}=\frac{2\cdot2\cdot5\cdot19}{5\cdot2\cdot2\cdot23}=\frac{19}{23}\)
\(14:\left(4\frac{1}{2}-2\frac{5}{8}\right)+14.\frac{1}{4}.\frac{2}{3}\)
\(=14:\frac{15}{8}+14.\frac{1}{6}\)
\(=14.\frac{8}{15}+14.\frac{1}{6}\)
\(=14.\left(\frac{8}{15}+\frac{1}{6}\right)\)
\(=14.\frac{7}{10}\)
\(=\frac{98}{10}\)
đúng thì ủng hộ nha
\(14\div\left(4\frac{1}{2}-2\frac{5}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}=14\div\left(\frac{9}{2}-\frac{21}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=14\div\frac{15}{8}+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=\frac{112}{15}+\frac{7}{3}\)
\(=\frac{49}{5}\)
CHÚC BẠN HỌC TỐT
\(\frac{-2}{5}\) \(.\) \(\frac{1}{8}\) = \(\frac{1}{8}\) \(.\) \(\frac{3}{5}\)= \(\frac{3}{40}\)
- Hok t -
Trả lời :
\(-\frac{2}{5}\cdot\frac{1}{8}=\frac{1}{8}\cdot\frac{3}{5}=\frac{3}{40}\)
1k đê
~HT~