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\(3+\frac{2}{5}-\frac{3}{4}\)X \(\frac{4}{5}\)
\(=\frac{3}{1}+\frac{2}{5}-\frac{3}{5}\)
\(=\frac{17}{5}-\frac{3}{5}\)
\(=\frac{14}{5}\)
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}-\frac{3}{5}\)
\(=3+\frac{-1}{5}\)
\(=\frac{15}{5}+\frac{-1}{5}\)
\(=\frac{14}{5}\)
\(\dfrac{3}{4}\times\dfrac{8}{5}:1\dfrac{1}{6}\)
=\(\dfrac{6}{5}:\) \(\dfrac{7}{6}\)
=\(\dfrac{6}{5}\times\dfrac{6}{7}=\dfrac{36}{35}\)
2\(\dfrac{1}{3}\) x 1\(\dfrac{1}{4}\) -\(\dfrac{7}{5}\)
\(\dfrac{7}{3}\times\dfrac{5}{4}-\) \(\dfrac{7}{5}\)
\(\dfrac{35}{12}-\dfrac{7}{5}\)
\(\dfrac{175}{60}-\dfrac{84}{60}=\dfrac{91}{60}\)
4\(\dfrac{2}{3}+1\dfrac{1}{4} +2\dfrac{1}{3}+2\dfrac{3}{7}\)
(4 +2) + \(\left(\dfrac{2}{3}+\dfrac{1}{3}\right)\) +1\(\dfrac{1}{4}\) + \(2\dfrac{3}{7}\)
6 + 1 + \(\dfrac{5}{4}\) + \(\dfrac{17}{7}\)
7 + \(\dfrac{103}{28}\)
\(\dfrac{299}{28}\)
Tại cô giáo chưa dậy đến đã giao bài về nhà nên mình mới không biết làm !!!
\(2\frac{1}{2}\times4\frac{2}{5}=\frac{5}{2}\times\frac{22}{5}=\frac{110}{10}=11\)
\(3\frac{5}{7}+1\frac{6}{7}=\frac{26}{7}+\frac{13}{7}=\frac{39}{7}\)
\(5\div1\frac{3}{5}=5\div\frac{8}{5}=5\times\frac{5}{8}=\frac{25}{8}\)
\(4\frac{1}{9}-2\frac{2}{3}=\frac{37}{9}-\frac{8}{3}=\frac{37}{9}-\frac{24}{9}=\frac{13}{9}\)
#Học tốt!!!
~NTTH~
\(2\frac{1}{2}×4\frac{2}{5}=\frac{5}{2}×\frac{22}{5}=11\)
\(3\frac{7}{5}+1\frac{6}{7}=\frac{22}{5}+\frac{13}{7}=\frac{219}{35}\)
\(5:1\frac{3}{5}=5:\frac{8}{5}=\frac{25}{8}\)
\(4\frac{1}{9}-2\frac{2}{3}=\frac{37}{9}-\frac{8}{3}=\frac{13}{9}\)
a, 6/9+5/7+1/3=2/3+5/7+1/3=5/7+1=12/7
b, 17/7+6/5-20/14=17/7+6/5-10/7=6/5+1=11/5
c,2/5x1/4+3/4x2/5=2/5x(1/4+3/4)=2/5x1=2/5
d, 6/11:4/6+5/11:2/3=6/11:2/3+5/11:2/3=(6/11+5/11):2/3=3/2
nha
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}+\frac{3}{5}\)
\(=3+1\)
\(=4\)