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a, 2 \(\times\) \(\dfrac{2}{4}\) : \(\dfrac{4}{5}\) b, \(\dfrac{7}{8}\) \(\times\) \(\dfrac{4}{5}\) : 3
= 1 : \(\dfrac{4}{5}\) = \(\dfrac{7}{10}\) : 3
= 1 \(\times\) \(\dfrac{5}{4}\) = \(\dfrac{7}{10}\) \(\times\) \(\dfrac{1}{3}\)
= \(\dfrac{5}{4}\) = \(\dfrac{7}{30}\)
\(2\times\dfrac{2}{4}:\dfrac{4}{5}\)
\(=1:\dfrac{4}{5}\)
\(=1\times\dfrac{5}{4}\)
\(=\dfrac{5}{4}\)
__________________________
\(\dfrac{7}{8}\times\dfrac{4}{5}:3\)
\(=\dfrac{7}{2}\times\dfrac{1}{5}:3\)
\(=\dfrac{7}{10}\times\dfrac{1}{3}\)
\(=\dfrac{7}{30}\)
Chúc bạn học tốt:>
= 3/4 + 1/3 = 13/12
5/4 x X = 5/8
X = 5/8 : 5/4
X = 1/2
vậy X = ...
Bài 1
1/2 x 3/4 : 4/5
= 3/8 : 4/5
= 3/8 x 5/4
= 15/32
2/3 + 1/6 - 1/2
= 4/6 + 1/6 - 3/6
= 5/6 - 3/6
= 1/3
3/5 + 4 : 2/3 - 3/2
= 3/5 + 4 x 3/2 - 3/2
= 3/5 + 6 - 3/2
= 3/5 + 30/5 - 3/2
= 33/5 - 3/2
= 66/10 - 15/10
= 28/5
Bài 2
x - 1/4 = 1/2
x = 1/2 + 1/4
x = 2/4 + 1/4
x = 3/4
2/3 + x = 1
x = 1 - 2/3
x = 3/3 - 2/3
x = 1/3
Bài 1:
a: x+1/2=5/6
nên x=5/6-1/2=1/3
b: x+1/4=3/4
nên x=3/4-1/4=2/4=1/2
c: x+3/10=1/2
nên x=1/2-3/10=5/10-3/10=1/5
d: x+1/4=3/8
nên x=3/8-1/4=3/8-2/8=1/8
a: \(x:5=\dfrac{15}{14}\\ \Rightarrow x=\dfrac{15}{70}=\dfrac{3}{14}\)
a: \(=\dfrac{3}{5}\cdot\dfrac{5}{4}+\dfrac{1}{2}\cdot\dfrac{2}{3}=\dfrac{3}{4}+\dfrac{1}{3}=\dfrac{9+4}{12}=\dfrac{13}{12}\)
b: \(\Leftrightarrow x\cdot\dfrac{5}{4}=\dfrac{5}{8}\)
hay x=1/2
phần b ghi rõ ra đc k ạ?