bài 1 :
\(\frac{5}{12}\) + \(\frac{1}{3}\) = \(\frac{5}{12}\) + \(\frac{4}{12}\) = \(\frac{5+4}{12}\) = \(\frac{9}{12}\) = \(\frac{3}{4}\)
1 - \(\frac{3}{4}\) = \(\frac{4}{4}\) - \(\frac{3}{4}\) = \(\frac{4-3}{4}\) = \(\frac{1}{4}\)
2 x \(\frac{3}{11}\) = \(\frac{2x3}{11}\) = \(\frac{6}{11}\)
\(\frac{8}{7}\): 4 = \(\frac{8}{7x4}\) = \(\frac{8}{28}\) = \(\frac{2}{7}\)
bài 2 :
\(\frac{2}{5}\) : y = \(\frac{1}{3}\)
y = \(\frac{2}{5}\) : \(\frac{1}{3}\)
y = \(\frac{6}{5}\)
y : \(\frac{7}{11}\) = 22
y = 22 x \(\frac{7}{11}\)
y = 14
ai thấy đúng tk nha
5/12 + 1/3 = 3/4
1 - 3/4 = 1/4
2 x 3/11 = 6/11
8/7 : 4 = 2/7
Tìm y
2/5 : y = 1/3
y =2/5 : 1/3
y = 6/5
y : 7/11 = 22
y = 22 x 7/11
y = 2/7
\(\frac{5}{12}+\frac{1}{3}=\frac{5}{12}+\frac{4}{12}=\frac{9}{12}\)\(=\frac{3}{4}\)
\(1-\frac{3}{4}=\frac{4}{4}-\frac{3}{4}=\frac{1}{4}\)
\(2\times\frac{3}{11}=\frac{6}{11}\)
\(\frac{8}{7}\div4=\frac{8}{7\times4}=\frac{2}{7}\)
Ta co \(\frac{2}{5}\div y=\frac{1}{3}\Rightarrow y=\frac{2}{5}\div\frac{1}{3}\Rightarrow y=\frac{6}{5}\)
\(y:\frac{7}{11}=22\Rightarrow y=22\times\frac{7}{11}\Rightarrow y=14\)
NHO K CHO MINH NHE
