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Tỉ số của 2 số là: 1/4
Tổng số phần bằng nhau là:
1 + 4 = 5 (phần)
Số thứ nhất là:
2015 : 5 x 1 = 403
Só thứ 2 là:
2015 - 403 = 1612
Đáp số: ST1: 403
ST2: 1612
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= [ ( - 7 ) + 13 ] - ( 13 - 7 - 25 ) - ( 25 + 10 - 9 )
= 6 - ( 6 - 25 ) - ( 35 - 9 )
= 6 - ( - 19 ) - 26
= 25 - 26
= - 1
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Lời giải:
$=(-7+|13|)-(13-|-7|-25)-(25+|-10|-9)$
$=(-7+13)-(13-7-25)-(25+10-9)$
$=-7+13-13+7+25-25-10+9$
$=(-7+7)+(13-13)+(25-25)-10+9=-10+9=-1$
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\(1.\) \(\dfrac{7}{36}-\dfrac{8}{-9}+\dfrac{-2}{3}=\dfrac{7}{36}+\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{7+32-24}{36}=\dfrac{5}{12}.\)
\(2.\) \(\dfrac{-1}{2}+\dfrac{3}{7}-\dfrac{1}{9}+\dfrac{-7}{18}+\dfrac{4}{7}=\dfrac{-9-2-7}{18}+\dfrac{4+3}{7}=\dfrac{-18}{18}+\dfrac{7}{7}=-1+1=0.\)
\(3.\) \(-\dfrac{10}{3}+\dfrac{13}{10}-\dfrac{1}{6}+\dfrac{1}{10}=\dfrac{13+1}{10}+\dfrac{-20-1}{6}=\dfrac{14}{10}+\dfrac{-21}{6}=\dfrac{7}{5}-\dfrac{7}{2}=-\dfrac{21}{10}.\)
\(4.\) \(\dfrac{10}{17}-\dfrac{5}{13}-\left(-\dfrac{7}{17}\right)-\dfrac{8}{13}+\dfrac{11}{25}=\dfrac{10+7}{17}+\dfrac{-5-8}{13}+\dfrac{11}{25}=\dfrac{17}{17}-\dfrac{13}{13}+\dfrac{11}{25}=\dfrac{11}{25}.\)
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1: \(=\dfrac{7}{36}+\dfrac{32}{36}+\dfrac{-24}{36}=\dfrac{15}{36}=\dfrac{5}{12}\)
2: \(=\left(-\dfrac{1}{2}-\dfrac{1}{9}-\dfrac{7}{18}\right)+\dfrac{3}{7}+\dfrac{4}{7}\)
\(=\dfrac{-9-2-7}{18}+1=-1+1=0\)
3: \(=\left(-\dfrac{10}{3}-\dfrac{1}{6}\right)+\dfrac{14}{10}\)
\(=-\dfrac{21}{6}+\dfrac{14}{10}=\dfrac{-7}{2}+\dfrac{14}{10}=\dfrac{-35+14}{10}=-\dfrac{21}{10}\)
4: \(=\left(\dfrac{10}{17}+\dfrac{7}{17}\right)-\left(\dfrac{5}{13}+\dfrac{8}{13}\right)+\dfrac{11}{25}=\dfrac{11}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(-7+|13|)-(13-|-7|-25)-(25+|-10|-9)=(-7+13)-(13-7-25)-(25+10-9)
= 6-(-19)-26
=6+19-26
= -1
cho 1 đúng nhé!
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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(\left(-7+|13|\right)-\left(13-|-7|-25\right)-\left(25+|10|-9\right)\)
=> \(\left(-7+13\right)-\left(13-7-25\right)-\left(25+10-9\right)\)
=> \(6-\left(-19\right)-26\)
=> \(-1\)