3 + 5 * 4 : 5 =? ai nhanh tick cho
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{5}+\dfrac{1}{4}=\dfrac{8}{20}+\dfrac{5}{20}=\dfrac{13}{20}\)
\(\dfrac{1}{3}+\dfrac{3}{5}=\dfrac{5}{15}+\dfrac{9}{15}=\dfrac{14}{15}\)
\(\dfrac{1}{2}+\dfrac{1}{4}=\dfrac{2}{4}+\dfrac{1}{4}=\dfrac{3}{4}\)
\(\dfrac{1}{8}+\dfrac{5}{6}=\dfrac{3}{24}+\dfrac{20}{24}=\dfrac{23}{24}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5 4 . 9 + 5 3 . 3 − 5 3 . 20
= 625 . 9 + 125 . 3 − 125 . 20
= 5625 + 375 − 2500
= 6000 − 2500
= 3500
5 4 . 9 + 5 3 . 3 − 5 3 . 20
= 652 .9 + 125 . 3 − 125. 20
= 5625 + 375 + 2500
= 6000 + 2500
= 8500
![](https://rs.olm.vn/images/avt/0.png?1311)
- 4 . 5 + ( - 4 ) . 2 + ( - 4 ) . 3 = - 4 . ( 5 + 2 + 3 ) = - 4 . 10 = -40
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\frac{3}{5}.\frac{7}{9}-\frac{3}{5}.\frac{2}{9}=\frac{3}{5}\left(\frac{7}{9}-\frac{2}{9}\right)=\frac{3}{5}.\frac{5}{9}=\frac{1}{3}\)
b)\(\frac{2006}{2005}.\frac{3}{4}-\frac{3}{4}.\frac{1}{2005}=\frac{3}{4}\left(\frac{2006}{2005}-\frac{1}{2005}\right)=\frac{3}{4}.1=\frac{3}{4}\)
k nhé Cô nàng đáng yêu!
3 / 5 * 7 / 9 - 3 / 5 * 2 / 9 = 15 / 45
2006 / 2005 * 3 / 4 - 3/4 * 1/ 2005 = 1203 / 1604
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
= \(\frac{1}{2}\)- \(\frac{2}{3}\)+ (\(\frac{3}{4}\)- \(\frac{3}{4}\)) + ( -\(\frac{4}{5}\)+ \(\frac{4}{5}\)) + ( \(\frac{5}{6}-\frac{5}{6}\)) - \(\frac{6}{7}\)
= \(\frac{1}{2}-\frac{2}{3}-0-0-0-\frac{6}{7}\)
= \(\frac{1}{2}-\frac{2}{3}-\frac{6}{7}\)
=\(\frac{21}{42}-\frac{28}{42}-\frac{36}{42}\)
= \(\frac{-43}{42}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5/4-yx5/6=-1/12
5/4-y = -1/12:5/6
5/4-y = -1/10
y = 5/4-(-1/10)
y = 27/20
\(\frac{5}{4}-y.\frac{5}{6}=\frac{1}{4}-\frac{1}{3}\)
\(\Rightarrow\frac{5}{4}-y.\frac{5}{6}=-\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}-\left(-\frac{1}{12}\right)\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}+\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{4}{3}\)
\(\Rightarrow y=\frac{4}{3}:\frac{5}{6}\)
\(\Rightarrow y=\frac{8}{5}\)
Vậy \(y=\frac{8}{5}.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Số cần tìm là:
1-1+3+4+5-3-4+4= 9
Đáp số: 9
Chúc bạn học giỏi
3 + 5 x 4 : 5
= 3 + 20 : 5
= 3 + 4
= 7
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= 3 + 20 : 5
= 3 + 4
= 7
Đúng 100%
Đúng 100%
Đúng 100%