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\(\dfrac{1}{2}:0,5-\dfrac{1}{4}:0,25+\dfrac{1}{5}:0,2-\dfrac{1}{8}:0,125\)
\(=\dfrac{1}{2}\times2-\dfrac{1}{4}\times4+\dfrac{1}{5}\times5-\dfrac{1}{8}\times8\)
\(=1-1+1-1=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1)\(y\times7:5+4\times8=134\)
\(\Leftrightarrow y\times7:5+32=134\)
\(\Leftrightarrow y\times7:5=102\)
\(\Leftrightarrow y\times7=510\)
\(\Leftrightarrow y=72,86\)
2) \(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{10}\)
\(=0,25:0,25-0,125:0,125+0,5:0,5-\dfrac{1}{10}\)
\(=1-1+1-\dfrac{1}{10}\)
\(=\dfrac{9}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{1}{2}:0,5+\dfrac{1}{4}:0,25+\dfrac{1}{8}:0,125\)
\(=\dfrac{1}{2}\times2+\dfrac{1}{4}\times4+\dfrac{1}{8}\times8\)
\(=\dfrac{2}{2}+\dfrac{4}{4}+\dfrac{8}{8}=1+1+1=3\)
1/2 : 0,5 + 1/4 : 0,25 + 1/8 :0,25
đổi 1/2=0,5;1/4=0,25;1/8=0,125
=0,5:0,5+0,25:0,25+0,125:0,125
=1+1+1
=3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{1}{4}:\dfrac{1}{4}-\dfrac{1}{8}:\dfrac{1}{8}+\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{10}\)
\(=1-1+1-\dfrac{1}{10}\)
= 0,9
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{10}\\ =\dfrac{1}{4}:\dfrac{1}{4}-\dfrac{1}{8}:\dfrac{1}{8}+\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{10}\\ =1-1+1-\dfrac{1}{10}\\ =\left(1-1\right)+\left(1-\dfrac{1}{10}\right)\\ =1-\dfrac{1}{10}\\ =\dfrac{10-1}{10}=\dfrac{9}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=1/4:1/4-1/8:1/8+1/2:1/2-1/10
=1-1+1-1/10
=1-1/10
=9/10
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Không khó đâu nhé em:
\(75\%+\frac{1}{4}-\frac{1}{4}:0,25+\frac{1}{8}:0,125-\frac{1}{2}:0,5\)
\(=\frac{3}{4}+\frac{1}{4}-\frac{1}{4}:\frac{1}{4}+\frac{1}{8}:\frac{1}{8}-\frac{1}{2}:\frac{1}{2}\)
\(=\frac{3}{4}+\frac{1}{4}-1+1-1\)
\(=1-1+1-1\)
\(=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1/4:0,25-1/8:0,125+1/2:0,5-1/10:0,1
=1/4x4-1/8x8+1/2x2-1/10x10
=4/4-8/8+2/2-10/10
=1-1+1-1
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\dfrac{1}{2}\): 5 + \(\dfrac{1}{4}\): 0,25 + \(\dfrac{1}{8}\): 0,125
A = \(\dfrac{1}{2}\) \(\times\) \(\dfrac{1}{5}\) + \(\dfrac{1}{4}\) \(\times\) 4 + \(\dfrac{1}{8}\) \(\times\) 8
A = \(\dfrac{1}{10}\) + 1 + 1
A = 0,1 + 2
A = 2,1
nhầm laf 1/2 : 5 + 1/4 : 0,25 + 1/8 : 0,125