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14 tháng 2 2023
\(a.\left(\dfrac{2}{5}.\dfrac{5}{2}\right).\dfrac{10}{21}=1.\dfrac{10}{21}=\dfrac{10}{21}\)
\(\dfrac{1}{2}.4+\dfrac{3}{4}.4=2+3=5\)
N
2
HM
7 tháng 5 2017
a) x : ( 12 x 15 ) = 8/3 x 4 x 15
x : 180 = 160
x = 160 : 180
x = 8/9
Vậy x = 8/9
b) ( 1/2 x 2/3 x 3/4 x 4/5 ) : x = 1 x 2 x 3 x 4/ 5 x 6 x 7 x 8
1/5 : x = 1/70
x = 1/5 : 1/70
x = 14
Vậy x = 14
NH
8 tháng 4 2023
a)
`9/2-3`
`=9/2-6/2`
`=3/2`
b)
`8/5xx25/12`
`=10/3`
c)
`4:3/7`
`=4xx7/3`
`=28/3`
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
24 tháng 10 2024
a; \(\dfrac{a}{b}\) + \(\dfrac{5}{6}\) = 1 - \(\dfrac{1}{8}\)
\(\dfrac{a}{b}\) + \(\dfrac{5}{6}\) = \(\dfrac{7}{8}\)
\(\dfrac{a}{b}\) = \(\dfrac{7}{8}-\dfrac{5}{6}\)
\(\dfrac{a}{b}=\) \(\dfrac{21}{24}\) - \(\dfrac{20}{24}\)
\(\dfrac{a}{b}=\dfrac{1}{24}\)
b; \(\dfrac{5}{8}-\dfrac{a}{b}\) = \(\dfrac{1}{4}+\dfrac{1}{6}\)
\(\dfrac{5}{8}-\dfrac{a}{b}\) = \(\dfrac{3}{12}+\dfrac{2}{12}\)
\(\dfrac{5}{8}-\) \(\dfrac{a}{b}\) = \(\dfrac{5}{12}\)
\(\dfrac{a}{b}\) = \(\dfrac{5}{8}-\dfrac{5}{12}\)
\(\dfrac{a}{b}\) = \(\dfrac{15}{24}\) - \(\dfrac{10}{24}\)
\(\dfrac{a}{b}\) = \(\dfrac{5}{24}\)
c; \(\dfrac{5}{6}\) - \(\dfrac{1}{4}\) - \(\dfrac{a}{b}\) = \(\dfrac{1}{2}\)
\(\dfrac{10}{12}-\dfrac{3}{12}\) - \(\dfrac{a}{b}\) = \(\dfrac{1}{2}\)
\(\dfrac{7}{12}\) - \(\dfrac{a}{b}\) = \(\dfrac{1}{2}\)
\(\dfrac{a}{b}\) = \(\dfrac{7}{12}\) - \(\dfrac{1}{2}\)
\(\dfrac{a}{b}\) = \(\dfrac{7}{12}-\dfrac{6}{12}\)
\(\dfrac{a}{b}=\dfrac{1}{12}\)
\(A,\dfrac{1}{4}+2\\ =\dfrac{1}{4}+\dfrac{2}{1}\\ =\dfrac{1}{4}+\dfrac{2\times4}{1\times4}\\ =\dfrac{1}{4}+\dfrac{8}{4}\\ =\dfrac{9}{4}\\ B,5-\dfrac{2}{3}\\ =\dfrac{5}{1}-\dfrac{2}{3}\\ =\dfrac{5\times3}{1\times3}-\dfrac{2}{3}\\ =\dfrac{15}{3}-\dfrac{2}{3}\\ =\dfrac{13}{3}.\)