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75% + 23/25 + 0,08 + 1/4
= 0,75 + 0,92 + 0,08 + 0,25
= (0,75 + 0,25) + (0,92 + 0,08)
= 1 + 1
= 2
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a) 23x51+75x23-23x25=23x(51+75-26)=23x100=2300
b) 1+2+3+...+20=\(\dfrac{\left(20+1\right)\text{x}20}{2}\)=210
a) \(23\times51+75\times23-23\times26\)
\(=23\times\left(51+75-26\right)\)
\(=23\times\left(126-26\right)\)
\(=23\times100\)
\(=2300\)
b) \(1+2+...+20\)
\(=\left(20+1\right)+\left(19+2\right)+\left(18+3\right)+\left(17+4\right)+...+\left(11+10\right)\)
\(=21+21+21+...+21\) (10 số 21)
\(=2100\)
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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, ...............................................
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= 25 x 75/100 + 75 x 0.92 + 25 x 0.25 + 75 x 8/100
= 25 x 0.75 + 75 x 0.92 + 25 x 0.25 + 75 x 0.08
= 25 x ( 0.75 + 0.25 ) + 75 x ( 0.92 + 0.08 )
= 25 x 1 + 75 x 1
= ( 25 + 75 ) x 1
= 100 x 1
= 100
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2345 x 25 + 2345 x 75 + 2345
= 2345 x (25+75+1)
= 2345 x 101
=236845
\(=2345\times\left(25+75+1\right)\)
\(=2345\times101\)
\(=236845\)
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a.125 x 3,75 x 0,08 x 2 = 125 x 0,08 x 2 x 3,75
= 10 x 2 x 3,75
= 20 x 3,75
= 75
![](https://rs.olm.vn/images/avt/0.png?1311)
75% + 23/25 + 0,08 + 1/4
= 0,75 + 0,92 + 0,08 + 0,25
= (0,75 + 0,25) + (0,92 + 0,08)
= 1 + 1
= 2