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a) 2-3/4=5/4
b) 5-1,5-\(1\frac{1}{2}\)=3,5-3/2=2
Ai k mik mik k lại
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5\dfrac{9}{10}:\dfrac{3}{2}-\left(2\dfrac{1}{3}\times4\dfrac{1}{2}-2\times2\dfrac{1}{3}\right):\dfrac{7}{4}\)
\(=\dfrac{59}{10}:\dfrac{3}{2}-\left(\dfrac{7}{3}\times\dfrac{9}{2}-2\times\dfrac{7}{3}\right):\dfrac{7}{4}\)
\(=\dfrac{59}{10}\cdot\dfrac{2}{3}-\left[\dfrac{7}{3}\times\left(\dfrac{9}{2}-2\right)\right]:\dfrac{7}{4}\)
\(=\dfrac{59}{15}-\left(\dfrac{7}{3}\times\dfrac{5}{2}\right):\dfrac{7}{4}\)
\(=\dfrac{59}{15}-\dfrac{35}{6}\cdot\dfrac{4}{7}\)
\(=\dfrac{59}{15}-\dfrac{10}{3}\)
\(=\dfrac{59}{15}-\dfrac{50}{15}\)
\(=\dfrac{9}{15}\)
\(=\dfrac{3}{5}\)
\(Toru\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x-5/7=3/5x1/2
x-5/7=3/10
x. =3/10+5/7
x. =71/70
b) Xx2/3=5/8x3/4
Xx2/3=15/32
X =15/32:2/3
X =45/64
a) x - 5/7 = 3/5 × 1/2
x - 5/7 = 3/10
x = 3/10 + 5/7
x = 71/70
b) x × 2/3 = 5/8 × 3/4
x × 2/3 = 15/32
x = 15/32 : 2/3
x = 45/64
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1.3.5+2.6.10+4.12.20+7.21.35}{1.5.7+2.10.14+4.20.28+7.35.49}\)
\(=\frac{1.3.5\left(1+2+4+7\right)}{1.5.7\left(1+2+7+7\right)}=\frac{1.3.5}{1.5.7}=\frac{15}{35}=\frac{3}{7}\)
\(\frac{1\cdot3\cdot5+2\cdot6\cdot10+4\cdot12\cdot20+7\cdot21\cdot35}{1\cdot5\cdot7+2\cdot10\cdot14+4\cdot20\cdot28+7\cdot35\cdot49}\)
\(=\)\(\frac{1\cdot3\cdot5\cdot\left(1+2+4+7\right)}{1\cdot5\cdot7\cdot\left(1+2+7+7\right)}\)
\(=\frac{1\cdot3\cdot5}{1\cdot5\cdot7}\)\(=\frac{15}{35}=\frac{3}{7}\)
bn vội quá viết nhầm lun kìa
hj hj chúc bn làm bài tốt nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(4\frac{5}{7}:1=\frac{33}{7}:1==\frac{33}{7}\)
\(\frac{5}{6}+2=\frac{5}{6}+\frac{12}{6}=\frac{17}{6}\)
\(\frac{7}{15}x\frac{21}{74}=\frac{7}{3x5}x\frac{3x7}{74}=\frac{7x7}{5x74}=\frac{49}{370}\)
trả lời đầy đủ giúp mìn ai trả lời mìn sẽ kb
a, 1 - (\(\dfrac{2}{5}\)+ \(\dfrac{1}{10}\)) = 1 - ( \(\dfrac{4}{10}\)+ \(\dfrac{1}{10}\)) = 1 - \(\dfrac{5}{10}\) = 1- \(\dfrac{1}{2}\) = \(\dfrac{2}{2}\) - \(\dfrac{1}{2}\) = \(\dfrac{1}{2}\)
b, 4 - \(\dfrac{5}{7}\) = \(\dfrac{28}{7}\) - \(\dfrac{5}{7}\) = \(\dfrac{23}{7}\)
c, \(\dfrac{5}{8}\) : \(\dfrac{1}{2}\) = \(\dfrac{5}{8}\) x \(\dfrac{2}{1}\) = \(\dfrac{5}{4}\)
3\(\dfrac{1}{2}\) : 2\(\dfrac{1}{4}\) = \(\dfrac{7}{2}\) : \(\dfrac{9}{4}\) = \(\dfrac{7}{2}\)x \(\dfrac{4}{9}\) = \(\dfrac{14}{9}\)