Thực hiện các phép tính sau: ( 15,37 - 12,37).0,12

* Hướng dẫn giải

a)  15, 37 – 12, 37) . 0,12 = 3. 0,12 = 0,36

$\begin{array}{l}b)6\frac{5}{12}:2\frac{3}{4}+11\frac{1}{4}.\frac{1}{3}-\frac{1}{5}=\frac{77}{12}:\frac{11}{4}+\frac{45}{4}.\frac{2}{15}=\frac{77}{33}+\frac{3}{2}=\frac{23}{6}\\ \\ c)\frac{5}{6}:\mathrm{0,125}-\left(2\frac{1}{4}-\mathrm{0,6}\right).\frac{10}{11}=\frac{5}{6}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right).\frac{10}{11}=\frac{155}{11}\\ \\ d)\mathrm{1,4.}\frac{15}{19}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}=\frac{7}{5}.\frac{15}{19}-\frac{22}{15}:\frac{11}{5}=\frac{21}{19}-\frac{2}{3}=\frac{25}{57}\\ \\ e\left)\right(-\mathrm{1,2}).\left(-\frac{3}{24}\right)+\left(\mathrm{0,4}-1\frac{4}{15}\right):1\frac{2}{3}=\left(-\frac{6}{5}\right).\left(-\frac{3}{24}\right)+\left(\frac{2}{5}-\frac{19}{15}\right):\frac{5}{3}=-\frac{37}{100}\\ \\ f)1\frac{13}{15}\mathrm{.0,75}-\left(\frac{11}{20}+25\%\right)=\frac{28}{15}.\frac{3}{4}-\left(\frac{11}{20}+\frac{1}{4}\right)=\frac{3}{5}\end{array}$