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\(a,\dfrac{3}{2}\times\dfrac{4}{5}\times\dfrac{2}{3}\times\dfrac{15}{4}\\ =\dfrac{3\times4\times2\times15}{2\times5\times3\times4}\\ =\dfrac{3\times4\times2\times5\times3}{2\times5\times3\times4}\\ =3\)
\(b,\dfrac{6}{7}\times\dfrac{5}{8}\times\dfrac{7}{3}\times\dfrac{7}{6}\times\dfrac{8}{5}\\ =\dfrac{6\times5\times7\times7\times8}{7\times8\times3\times6\times5}\\ =\dfrac{7}{3}\)
a) \(\dfrac{3}{2}\times\dfrac{4}{5}\times\dfrac{2}{3}\times\dfrac{15}{4}\)
\(=\left(\dfrac{3}{2}\times\dfrac{2}{3}\right)\times\left(\dfrac{4}{5}\times\dfrac{15}{4}\right)\)
\(=1\times3\)
\(=3\)
b) \(\dfrac{6}{7}\times\dfrac{5}{8}\times\dfrac{7}{3}\times\dfrac{7}{6}\times\dfrac{8}{5}\)
\(=\left(\dfrac{6}{7}\times\dfrac{7}{6}\right)\times\left(\dfrac{5}{8}\times\dfrac{8}{5}\right)\times\dfrac{7}{3}\)
\(=1\times1\times\dfrac{7}{3}\)
\(=\dfrac{7}{3}\)
Chúc bạn học tốt
= (2/5 + 3/5) + (6/9 + 1/3) + (7/4 + 1/4)
= 1 + (6/9 + 3/9) + 2 = 1 + 1 + 2 = 4
\(\dfrac{2}{5}+\dfrac{6}{9}+\dfrac{7}{4}+\dfrac{3}{5}+\dfrac{1}{3}+\dfrac{1}{4}\\ =\left(\dfrac{2}{5}+\dfrac{3}{5}\right)+\left(\dfrac{7}{4}+\dfrac{1}{4}\right)+\left(\dfrac{2}{3}+\dfrac{1}{3}\right)\\ =1+2+1=4\)
\(\frac{6}{5}\)- \(\frac{5}{8}\)-\(\frac{3}{8}\)
= \(\frac{6}{5}\)- \(\left(\frac{5}{8}+\frac{3}{8}\right)\)
=\(\frac{6}{5}\)- \(\frac{8}{8}\)
=\(\frac{8}{40}\)
\(\frac{6}{5}\)\(-\) \(\frac{5}{8}\)\(-\) \(\frac{3}{8}\)
=\(\frac{6}{5}\)\(-\) \(\left(\frac{5}{8}-\frac{3}{8}\right)\)
= \(\frac{6}{5}\)\(-\)\(\frac{1}{4}\)
= \(\frac{24}{20}\)\(-\)\(\frac{5}{20}\)
= \(\frac{19}{20}\)
`a: =(7/3-4/3)+11/5=16/5`
`b: =(18/13-5/13)+55/46=1+55/46=101/46`
`c: =27/25-4/9-2/25+5/9=(27/25-2/25)+(5/9-4/9)=1+1/9=10/9`
5 x 5 + 3 x 5 x 2 - 10 x 5
= 5 x ( 5 + 3 + 2 - 10 )
= 5 x 0
= 0
`5 . 5 + 3.5+5.2-10.5`
`=5.(5+3+2-10)`
`=5.0`
`=0`