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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{37}{89}\)\(\frac{38}{89}\)\(\frac{78}{89}\)\(\frac{37}{98}\)
\(\frac{12}{17}\)\(\frac{14}{17}\)\(\frac{18}{17}\)\(\frac{12}{19}\)
\(\frac{49}{60}\)\(\frac{5}{6}\)\(\frac{4}{5}\)\(\frac{3}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=89:0,25+89:0,2+89\)
\(=>A=89\cdot4+89\cdot5+89\cdot1\)
\(=>A=89\cdot\left(4+5+1\right)\)
\(=>A=89\cdot10\)
\(=>A=890\)
\(B=\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+.....+\frac{1}{9\cdot10}\)
\(=>B=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+.....+\frac{1}{9}-\frac{1}{10}\)
\(=>B=1-\frac{1}{10}\)
\(=>B=\frac{10}{10}-\frac{1}{10}\)
\(=>B=\frac{9}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
89 : 0,2 + 89 + 89 : 0,25
= 89 x 5 + 89 + 89 x 4
= 89 x (5 + 1 + 4)
= 89 x 10
= 890
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 13 : 1,6 : 0,5 = 13 : ( 1,6 x 0,5 ) = 13 : 0,8 = 16,25
b, 89 : 0,25 + 89 : 0,2 : 89 = 356 + 89 : 0,2 : 89 = 356 + 445 : 89 = 356 + 5 = 361
c, ...............................................
![](https://rs.olm.vn/images/avt/0.png?1311)
\(89:0,2+89+89:0,25=89\times5+89+89\times4=89\times\left(5+1+4\right)=89\times10=890\)
89:0.2 + 89 + 89 : 0.25
=89.5+89.1+89.4
= 89. ( 5 + 1 + 4 )
= 89 .10
=890
![](https://rs.olm.vn/images/avt/0.png?1311)
89 *16 - 89 * 25 +89 * 59
= 89 * (16 - 25 + 59)
= 89 * 50
= 98 * 100 : 2
= 9800 : 2
= 4900
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 89 : 0,25 + 89 : 0,2 + 89
= 89 x 4 + 89 x 5 + 89 x 1
= 89 x (4+5+1)
= 89 x 10
= 890
b, 24 : 12 + 36 : 6 + 18 : 9
= 2 + 6 + 2
= 10
a ) 89 : 0,25 + 89 : 0,2 + 89
= 89 x 4 + 89 x 5 + 89
= 89 x ( 4 + 5 + 1 )
= 89 x 10
= 890
b ) 24 : 12 + 36 : 6 + 18 : 9
= 2 + 6 + 2
= 10
Đáp án C