1,(279)+2,(720)=?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=1+0,\left(001\right).279+2+0,\left(001\right).720=3+\frac{279}{999}+\frac{720}{999}=3+\frac{999}{999}=3+1=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(1,\left(279\right)=1+279.0,\left(001\right)=1+279.\frac{1}{999}=\frac{142}{111}\);
\(2,\left(720\right)=2+720.0,\left(001\right)=2+720.\frac{1}{999}=\frac{302}{111}\)
\(\Rightarrow1,\left(279\right)+2,\left(720\right)=\frac{142}{111}+\frac{302}{111}=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1,(279)+2,(720)=\(\frac{142}{111}+\frac{302}{111}=\frac{444}{111}=4\)
1,(279) + 2(720) = 2 + 1 + [0,(279 + 0,(720)]
= 3 + 1 = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
1,(279)=1+0,(279)=1+279/999=142/111
2,(720)=2+0,(720)=2+720/999=302/111
=>1,(279)+2,(720)=142/111+302/111=444/111=4
tick nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
1,(279)+2,(720)
=\(\left(1+\frac{279}{999}\right)+\left(2+\frac{720}{999}\right)\)
=\(\frac{142}{111}+\frac{302}{111}\)
=4
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 2 3 x + 5 2 x = 2 5 2 + 2 3 - 33
8x+25x = 33
33x = 33
x = 1
b, 260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2
260:(x+4) = 5.13–3.13
x+4 = 260:26
x+4 = 10
x = 6
c, 720 : [ 41 - 2 x - 5 ] = 2 3 . 5
41–(2x–5) = 720:40
2x–5 = 41–18
2x = 28
x = 14
d, 3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2
7(x–12)+35 = 56
7(x–12) = 21
x–12 = 3
x = 15
1,(279) + 2,(720) = 1 + 2 + 1/999*(279 + 720)
= 3 + 1 = 4