a] [ 48 x 0,75 - 240 chia10 ] - [ 16 x 0,5 - 16 chia 4] b ] [ 1/2 CONG 3/5 - 2/15 ] CHIA 3/5 C] [ 13/84 x 2/5 - 1/2 x 7/180 ] chia 27/18 cong 1/2 x...
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a] [ 48 x 0,75 - 240 chia10 ] - [ 16 x 0,5 - 16 chia 4] b ] [ 1/2 CONG 3/5 - 2/15 ] CHIA 3/5 C] [ 13/84 x 2/5 - 1/2 x 7/180 ] chia 27/18 cong 1/2 x 1/10
\(a,\left(48\cdot0,75-240:10\right)-\left(16\cdot0,5-16:4\right)\)
\(=\left(48\cdot0,75-240\cdot0,1\right)-\left(16:2-16:4\right)\)
\(=\left(36-24\right)-\left(8-4\right)\)
\(=12-4=8\)
\(b,\left(\frac{1}{2}+\frac{3}{5}-\frac{2}{15}\right):\frac{3}{5}\)
\(=\left(\frac{11}{10}-\frac{2}{15}\right):\frac{3}{5}\)
\(=\frac{29}{30}:\frac{3}{5}=\frac{145}{90}=\frac{29}{18}\)
\(c,\left(\frac{13}{84}\cdot\frac{2}{5}-\frac{1}{2}\cdot\frac{7}{180}\right):\frac{27}{18}+\frac{1}{2}\cdot\frac{1}{10}\)
\(=\left(\frac{26}{420}-\frac{7}{360}\right):\frac{3}{2}+\frac{1}{20}\)
\(=\left(\frac{13}{210}-\frac{7}{360}\right):\frac{3}{2}+\frac{1}{20}\)
\(=\frac{107}{2520}:\frac{3}{2}+\frac{1}{20}\)
\(=\frac{214}{7560}+\frac{1}{20}=\frac{214}{7560}+\frac{378}{7560}\)
\(=\frac{592}{7560}=\frac{74}{945}\)
Trả lời:
a, \(\left(48\times0,75-240\div10\right)-\left(16\times0,5-16\div4\right)\)
\(=\left(36-24\right)-\left(8-4\right)\)
\(=12-4\)
\(=8\)
b,\(\left(\frac{1}{2}+\frac{3}{5}-\frac{2}{15}\right)\div\frac{3}{5}\)
\(=\left(\frac{11}{10}-\frac{2}{15}\right)\times\frac{5}{3}\)
\(=\frac{29}{30}\times\frac{5}{3}\)
\(=\frac{29}{18}\)
c,\(\left(\frac{13}{84}\times\frac{2}{5}-\frac{1}{2}\times\frac{7}{180}\right)\div\frac{27}{18}+\frac{1}{2}\times\frac{1}{10}\)
\(=\left(\frac{13}{210}-\frac{7}{360}\right)\times\frac{18}{27}+\frac{1}{2}\times\frac{1}{10}\)
\(=\frac{107}{2520}\times\frac{18}{27}+\frac{1}{20}\)
\(=\frac{107}{3780}+\frac{1}{20}\)
\(=\frac{74}{945}\)