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\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}+\frac{1}{3}\right)=\frac{4}{5}.\frac{3}{3}=\frac{4}{5}.1=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}+\frac{1}{6}\right)=\frac{3}{4}:\frac{2}{3}=\frac{9}{8}\)
\(\frac{2}{3}.\frac{4}{5}-\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}-\frac{1}{3}\right)=\frac{4}{5}.\frac{1}{3}=\frac{4}{15}\)
\(\frac{1}{2}:\frac{3}{4}-\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}-\frac{1}{6}\right)=\frac{3}{4}:\frac{1}{3}=\frac{9}{4}\)
\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\left(\frac{2}{3}+\frac{1}{3}\right).\frac{4}{5}=1.\frac{4}{5}=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{1}{2}.\frac{4}{3}+\frac{1}{6}.\frac{4}{3}=\left(\frac{1}{2}+\frac{1}{6}\right).\frac{4}{3}=\frac{2}{3}.\frac{4}{3}=\frac{8}{9}\)
c,d tương tự
Tại cô giáo chưa dậy đến đã giao bài về nhà nên mình mới không biết làm !!!
\(a.1\frac{1}{3}+2\frac{1}{2}\)
\(=\frac{4}{3}+\frac{5}{2}\)
\(=\frac{8}{6}+\frac{15}{6}\)
\(=\frac{23}{6}\)
\(b.3\frac{2}{5}-1\frac{1}{7}\)
\(=\frac{17}{5}-\frac{8}{7}\)
\(=\frac{119}{35}-\frac{40}{35}\)
\(=\frac{79}{35}\)
\(c.3\frac{1}{2}.1\frac{1}{7}\)
\(=\frac{7}{2}.\frac{8}{7}\)
\(=4\)
\(d.4\frac{1}{6}:2\frac{1}{3}\)
\(=\frac{25}{6}:\frac{7}{3}\)
\(=\frac{25}{6}.\frac{3}{7}\)
\(=\frac{25}{14}\)
\(a,2\frac{1}{18}+3\frac{5}{6}+1\frac{2}{3}\)
\(=2+\frac{1}{18}+3+\frac{5}{6}+1+\frac{2}{3}\)
\(=(2+3+1)+(\frac{1}{18}+\frac{5}{6}+\frac{2}{3})\)
\(=6+(\frac{1}{18}+\frac{15}{18}+\frac{12}{18})\)
\(=6+\frac{28}{18}\)
\(=6+\frac{14}{9}=7\frac{5}{9}=\frac{68}{9}\)
\(b,5\frac{3}{7}+(2\frac{5}{21}-1\frac{2}{3})\)
\(=5+\frac{3}{7}+2+\frac{5}{21}-1-\frac{2}{3}\)
\(=(5+2-1)+(\frac{3}{7}+\frac{5}{21}-\frac{2}{3})\)
\(=6+(\frac{9}{21}+\frac{5}{21}-\frac{14}{21})\)
\(=6+0=6\)
Chúc bạn học tốt
a) \(2\frac{1}{8}+3\frac{5}{6}+1\frac{2}{3}\)
\(=2\frac{3}{24}+3\frac{20}{24}+1\frac{16}{24}\)
\(=\left(2+3+1\right)+\frac{3+20+16}{24}\)
\(=6+\frac{13}{8}\)
\(=7\frac{5}{8}=\frac{61}{8}\)
b)\(5\frac{3}{7}+\left(2\frac{5}{21}-1\frac{2}{3}\right)\)
\(=5\frac{9}{21}+\left(2\frac{5}{21}-1\frac{14}{21}\right)\)
\(=5\frac{9}{21}+2\frac{5}{21}-1-\frac{14}{21}\)
\(=\left(5+2-1\right)+\frac{9+5-14}{21}\)
\(=6+0=6\)
\(2\frac{3}{4}+1\frac{5}{6}+3\frac{1}{4}+2\frac{1}{6}\)
= \(\frac{11}{4}+\frac{11}{6}+\frac{13}{4}+\frac{13}{6}\)
= \(\left(\frac{11}{4}+\frac{13}{4}\right)+\left(\frac{11}{6}+\frac{13}{6}\right)\)
= \(\frac{24}{4}+\frac{24}{6}\)
= \(6+4\)
= \(10\)
\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
\(=4+\frac{2}{5}+5+\frac{6}{9}+2+\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
\(=4+\frac{2}{5}+5+\frac{2}{3}+2+\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\left(\frac{2}{3}+\frac{1}{3}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)+\left(4+5+2\right)\)
\(=1+1+1+11\)
\(=14\)
=22/5+51/9+11/4+3/5+1/3+1/4
=(22/5+3/5)+(11/4+1/4)+(51/9+1/3)
=5+3+6
=14
