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a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\))
= 60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)
= 35 + 16
= 51
a,\(60\times\left(\frac{7}{12}+\frac{4}{15}\right)\)\(=\frac{60\times7}{12}+\frac{60\times4}{15}\)
\(=\frac{12\times5\times7}{12}+\frac{15\times4\times4}{15}\)
\(=5\times7+4\times4\)
\(=35+16\)
\(=51\)
b, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
a)12/5-4/9x5/6=274/135
b)5/6x9/20:2/3=9/16
c)8/9x7/4+5/12x8/3=8/3
a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\))
= 60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)
= 35 + 16
= 51
A\(\frac{4}{5}\times\left(\frac{5}{6}+\frac{1}{3}\right)\)
\(=\frac{4}{5}\times\frac{7}{6}\)
\(=\frac{28}{30}=\frac{14}{15}\)
B\(4:\frac{3}{5}-\frac{5}{6}\)
\(=\frac{20}{3}-\frac{5}{6}\)
\(=\frac{35}{6}\)
C\(\frac{7}{4}+\frac{5}{12}\times8\)
\(=\frac{7}{4}+\frac{10}{3}\)
\(=\frac{61}{12}\)
a) 4/5 x ( 5/6 + 1/3 ) = 4/5 x 21/18 = 84/90
b) 4 ∶ 3/5- 5/6 = 20/5 - 5/6 = 95/30
c) 7/4 + 5/12 x 8 = 7/4 +40/12 = 244/96
K nha