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![](https://rs.olm.vn/images/avt/0.png?1311)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
a)67/63 x 15/3 + 15/31 x 11/21
Thiếu đề
b)15/31 x 34/63 - 11/21 x 15/31
=15/31 x ( 34/63 -11/21)
= 15/31 x 1/63= 5/651
![](https://rs.olm.vn/images/avt/0.png?1311)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: =67/63⋅5+11/31⋅5/7=5(67/63+11/31⋅7)=10880/1953
![](https://rs.olm.vn/images/avt/0.png?1311)
a.\(\dfrac{18}{15}+\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{18+7+12}{15}=\dfrac{37}{15}\)
b.\(\dfrac{9}{7}+\dfrac{8}{7}+\dfrac{11}{7}=\dfrac{9+8+11}{7}=\dfrac{28}{7}=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{3}{5}\times\dfrac{17}{21}+\dfrac{17}{21}\times\dfrac{2}{5}\)
\(=\dfrac{17}{21}\times\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\)
\(=\dfrac{17}{21}\times1\)
\(=\dfrac{17}{21}\)
b) \(\dfrac{15}{8}:\dfrac{5}{20}-\dfrac{7}{8}:\dfrac{1}{4}\)
\(=\dfrac{15}{8}\times\dfrac{20}{5}-\dfrac{7}{8}\times4\)
\(=\dfrac{15}{8}\times4-\dfrac{7}{8}\times4\)
\(=4\times\left(\dfrac{15}{8}-\dfrac{7}{8}\right)\)
\(=4\times1\)
\(=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 : Tính bằng cách thuận tiện nhất
a) 15/21 + 7/21 + 5/21 = ( 15/21 + 5/21 ) + 7/21 = 20/21 + 7/21 = 27/21 = 9/7.
b) 4/7 + 8/15 + 22/15 = 4/7 + ( 8/15 + 22/15 ) = 4/7 + 30/15 = 4/7 + 2 = 4/7 + 14 /7 = 18/7.
Bài 2 : Giải :
Số học sinh trung bình chiếm số phần học sinh cả lớp là :
1 - 1/5 = 4/5 ( học sinh cả lớp )
Đáp số : 4/5 học sinh cả lớp.
![](https://rs.olm.vn/images/avt/0.png?1311)
21+22+23+24+25+26+9+8+7+6+5+4 =180
mình thấy rồng con lon ton làm đúng đấy
![](https://rs.olm.vn/images/avt/0.png?1311)
60x [7/12+4/15]
60x153/180
=9180/180
b 1/2x2/3x3/4x4/5x5/6x6/7x7/8x8/9=40320/4032
a) 15/21 + 7/21 + 5/21
= (15/21 + 5/21) + 7/21
= 20/21 + 7/21
= 27/21
b) 4/7 + 8/15 + 22/15
= 4/7 + 2
= 18/7
nha bn
a,\(\frac{15}{21}+\frac{7}{21}+\frac{5}{21}\)
= \(\left(\frac{15}{21}+\frac{5}{21}\right)+\frac{7}{21}\)
= \(\frac{20}{21}+\frac{7}{21}\)
=\(\frac{27}{21}\)
b, \(\frac{4}{7}+\frac{8}{15}+\frac{22}{15}\)
=\(\frac{4}{7}+\left(\frac{8}{15}+\frac{22}{15}\right)\)
= \(\frac{4}{7}+2\)
= \(\frac{18}{7}\)