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Buổi sáng mẹ bán được số quả trứng là :
\(600\times\dfrac{2}{5}=240\left(quả\right)\)
Buổi chiều mẹ bán được số quả trứng là
\(600\times\dfrac{1}{6}=100\left(quả\right)\)
Còn lại số quả trứng là
\(600-240-100=260\left(quả\right)\)
Đáp số 260 quả trứng
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{2}{3}+\dfrac{4}{15}=\dfrac{10}{15}+\dfrac{4}{15}=\dfrac{14}{15}\)
b) \(\dfrac{9}{10}-\dfrac{2}{5}=\dfrac{9}{10}-\dfrac{4}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
c) \(\dfrac{5}{3}\times\dfrac{9}{5}=\dfrac{45}{15}=3\)
d) \(\dfrac{3}{7}:2=\dfrac{3}{7}\times\dfrac{1}{2}=\dfrac{3}{14}\)
a 2/3 + 4/15= 10/15 + 4/15= 14/15
b, 9/10 - 2/5= 9/10 - 4/10 = 5/10 = 1/2
c, 5/3 x 9/5 = 9/3 = 3
d, 3/7 : 2= 3/7 : 2/1 = 3/7 x 1/2 = 3/14
![](https://rs.olm.vn/images/avt/0.png?1311)
`7/12 + 3/4 xx 2/9`
`= 7/12 + 1/6`
`= 9/12`
_________________
`8/9 - 4/15 : 2/5`
`= 8/9 - 2/3`
`= 2/9`
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =7/5-1/3=21/15-5/15=16/15
b: x:5=7/6+2/3
=>x:5=7/6+4/6=11/6
=>x=55/6
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,2+\dfrac{2}{3}=\dfrac{6}{3}+\dfrac{2}{3}=\dfrac{8}{3}\\ \dfrac{6}{9}-\dfrac{6}{11}=\dfrac{66}{99}-\dfrac{54}{99}=\dfrac{12}{99}=\dfrac{4}{33}\\ b,21\times\dfrac{4}{7}=12\\ \dfrac{54}{30}:\dfrac{6}{5}=\dfrac{9}{5}\times\dfrac{5}{6}=\dfrac{3}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y:\dfrac{3}{11}=\dfrac{7}{6}+\dfrac{2}{3}\)
\(y:\dfrac{3}{11}=\dfrac{11}{6}\)
\(y=\dfrac{11}{6}\times\dfrac{3}{11}\)
\(y=\dfrac{1}{2}\)
Bài 3
\(\dfrac{3}{7}:\dfrac{1}{4}-\dfrac{1}{2}=\dfrac{3}{7}\times\dfrac{4}{1}-\dfrac{1}{2}=\dfrac{12}{7}-\dfrac{1}{2}=\dfrac{24}{14}-\dfrac{7}{14}=\dfrac{17}{14}\)
`2)`
`y:3/11=7/6+2/3`
`y:3/11=11/6`
`y=11/6xx3/11`
`y=1/2`
`3)`
`=12/7-1/2=24/14-7/14=17/14`
![](https://rs.olm.vn/images/avt/0.png?1311)
= 26 x 182 + 182 x 47 + 91 x 27 x 2
= 26 x 182 + 182 x 47 + 182 x 27
= 182 x ( 26 + 47 + 27)
= 182 x 100 = 18200
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\) \(\times\) \(\dfrac{1}{2}\) = 1 - \(\dfrac{1}{3}\)
\(x\) \(\times\)\(\dfrac{1}{2}\) = \(\dfrac{2}{3}\)
\(x\) = \(\dfrac{2}{3}\) : \(\dfrac{1}{2}\)
\(x\) = \(\dfrac{4}{3}\)
Phần diện tích làm bồn hoa chiếm:
1-2/7-3/5=4/35(tổng diện tích)