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![](https://rs.olm.vn/images/avt/0.png?1311)
a, 5,26 + 8,85 + 1,15 + 4,74
= ( 5,26 + 4,74) + ( 8,85 + 1,15)
= 10 + 10
= 20
b, 0,25 \(\times\) 8 \(\times\) 4 \(\times\) 0,5 \(\times\) 0,125 \(\times\) 2
= ( 0,25 \(\times\) 4) \(\times\) ( 8 \(\times\) 0,125) \(\times\) ( 0,5 \(\times\) 2)
= 1 \(\times\)1 \(\times\) 1
= 1
c, 7,2 \(\times\)111 + 3,6 \(\times\) 2 \(\times\) 890 + \(1,8\) \(\times\) 4 \(\times\) 999
= 7,2 \(\times\) 111 + 7,2 \(\times\) 890 + 7,2 \(\times\) 999
= 7,2 \(\times\) ( 111 + 890 + 999)
= 7,2 \(\times\) { ( 111 + 999) + 890}
=7,2 \(\times\) { 1110 + 890}
= 7,2 \(\times\) 2000
= 14400
![](https://rs.olm.vn/images/avt/0.png?1311)
0,25 x y = 0,125 + 0,5
0,25 x y = 0,625
y = 0,625 : 0,25
y = 0,25
vậy x = ...
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 6 + y x 3 + y = 80
y x 6 + y x 3 + y x 1 = 80
y x (6+3+1)=80
y x 10 =80
y =80:10
y =8
a) \(y\times6+y\times3+y=80\)
\(\Leftrightarrow y\times\left(6+3+1\right)=80\)
\(\Leftrightarrow y\times10=80\)
\(\Leftrightarrow y=80\div10\)
\(\Leftrightarrow y=8\)
b) \(y+y\div0,5+y\div0,25+y\div0,125=15\)
\(\Leftrightarrow y+y\times2+y\times4+y\times8=15\)
\(\Leftrightarrow y\times\left(1+2+4+8\right)=15\)
\(\Leftrightarrow y\times15=15\)
\(\Leftrightarrow y=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y+y:0,5+y:0,25+y:0,125=15\)
\(y.1+y.2+y.4+y.8=15\)
\(y.\left(1+2+4+8\right)=15\)
\(y.15=15\)
\(y=1\)
. là dấu nhân!
![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
y : 0,25 + y : 0,125 + y: 0,5 = 1
=> y : 1/4 + y : 1/8 + y : 1/2 = 1
=> y . 4 + y . 8 + y . 2 = 1
=> y.(4 + 8 + 2) = 1
=> y . 14 = 1
=> y = 1/14
Vậy ...
\(y\div0,25+y\div0,125+y\div0,5=1,0\)
\(y\div\left(0,25+0,125+0,5\right)=1,0\)
\(y\div0,875=1,0\)
\(y=1,0\times0,875\)
\(y=0,875\)
Học tốt #
a,100,8:12-4,74
=8,4-4,74
=3,66
b,0,25.y-0,5=0,125
0,25y=0,125+0,5
0,25y=0,625
y=0,625:0,25
y=2,5
HT
TL
a) Tính: 100,8 : 12 – 4,74
= 8,4 - 4,74
= 3.66
b) 0,25 x y - 0,5 = 0,125
0,25 x y = 0,125 + 0,5
0,25 x y = 0,625
y = 0,625 : 0,25
y = 2,5
Ht xin k