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= (30 x 2) + (20 x 5) + (25 x 4)
= 60 + 100 + 100
= 260
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{5}\div0,5+\frac{3}{5}\div0,25\)
\(=\frac{3}{5}\div\left(0,5+0,25\right)\)
\(=\frac{3}{5}\div\frac{3}{4}\)
\(=\frac{4}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : A = 0.25 . 12 : 0,5 - ( 5,1 - 10,2 . 0,5 ) : 0,125
= 1/4 . 12 .2 - ( 51/10 - 51/5 . 1/2 ) . 8
= 6 - ( 51/10 - 51/10 ) .8
= 6 - 0 .8
= 6
Vậy A = 6
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1/2:0,5 - 1/4 ; 0,25 + 1/8 : 0,125 - 1/10 ; 0,1
= 0,5 : 0,5 - 0,25 : 0,25 + 0,125 : 0,125 - 0,1 : 0,1
= 1 - 1 + 1 - 1
= 0 + 1 - 1
= 1 - 1
= 0
Lời giải:
$=\frac{1}{2}\times 2-\frac{1}{4}\times 4+\frac{1}{8}\times 8-\frac{1}{10}\times 10$
$=1-1+1-1=0$
![](https://rs.olm.vn/images/avt/0.png?1311)
3/14 : 0,5 + 3/28 :0,25+3/56
= 3/7 + 3/7 + 3/56
= 6/7 +3/56
= 51/56
\(\frac{3}{14}:0,5+\frac{3}{28}:0,25+\frac{3}{56}\)
=\(\frac{3}{14}.2+\frac{3}{28}.4+\frac{3}{56}\)
=\(\frac{3}{7}+\frac{3}{7}+\frac{3}{56}\)
= \(\frac{24}{56}+\frac{24}{56}+\frac{3}{56}\)
=\(\frac{51}{56}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 0,25 x 12 : 0,5 - ( 5,1 - 10,2 x 0,5 ) : 0,125
A = 3 x 12 : 0,5 - ( 5,1 - 5,1 ) : 0,125
A = 36 : 0,5 - 0 : 0,125
A = 72 - 0
A =72
# HOK TỐT #
Ta có : A = 0,25 x 12 : 0,5 - ( 5,1 - 10,2 x 0,5 ) : 0,125
= 3 : 0,5 - ( 5,1 - 5,1 ) : 0,125
= 6 - 0 : 0,125
= 6 - 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{2}:0,5-\frac{1}{4}:0,25+\frac{1}{8}:0,125-\frac{1}{10}:0,1\)
\(=\frac{1}{2}\times2-\frac{1}{4}\times4+\frac{1}{8}\times8-\frac{1}{10}\times10\)
\(=1-1+1-1\)
\(=0\)
= 100 + 80 = 180
180