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![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( x . 0,25+1999).2000=(53+1999).2000
=> 500x + 1999 . 2000 = 53 . 2000 + 1999 . 2000
=> 500x = 53 . 2000 + 1999 . 2000 - 1999 .2000
=> 500x = 53 . 2000
=> x = 53 . 2000 : 500
=> x = 53 . 4
=> x = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x\cdot0,25-1999\right)\cdot2000=\left(53+1999\right)\cdot2000\)
\(=\left(x\cdot0,25-1999\right)\cdot2000=4104000\)
\(\Rightarrow x\cdot0,25-1999=4104000:2000\)
\(\Rightarrow x\cdot0,25=2052+1999\)
\(\Rightarrow x=4051:0,25\)
\(\Rightarrow x=16204\)
Ủng hộ mk nka!^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
( X x 0,25 + 1999) x 2000=( 53+1999) x 2000
( X x 0,25 + 1999) = ( 53+1999) x 2000 : 2000
( X x 0,25 + 1999) = ( 53+1999)
( X x 0,25 + 1999) = 2052
X x 0,25 = 2052 -1999
X x 0,25 = 53
X = 53 : 0,25
X = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\left(x\times0,25+1999\right)\times2000=2052\times2000\\ \left(x\times0,25+1999\right)\times2000=4104000\\ x\times0,25+1999=4104000:2000\\ x\times0,25+1999=2052\\ x\times0,25=2052-1999\\ x\times0,25=53\\ x=53:0,25\\ x=212\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{x+140}{x+260}=71+65.4\)
\(\Leftrightarrow\frac{x+140}{x+260}=71+260\)
\(\Leftrightarrow\frac{x+140}{x+260}=331\)
\(\Leftrightarrow x+140=\left(x+260\right)331\)
\(\Leftrightarrow x+140=86060+331x\)
\(\Leftrightarrow x-331x=85920\)
\(\Leftrightarrow x\left(331-1\right)=85920\)
\(\Leftrightarrow x330=85920\)
\(\Leftrightarrow x\approx260,2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( X x 0,25+ 1999) x2000= ( 53+1999) x2000
( X x 0,25+ 1999) = ( 53+1999)x2000:2000
( X x 0,25+1999) =( 53+1999)
( X x 0,25+1999) = 2052
X+0,25 = 2052 - 1999
X+ 0,25 = 53
X = 53:0,25
X = 212
71+65 x4 = x+140/x + 260
x+140/x + 260= 71+65x4
x+140/x + 260=71 + 260
x+140/x=71
x/x +140/x=71
1+ 140/x=71
140/x=71-1
140/x=70
x=140/70
x=2
k nha linh
![](https://rs.olm.vn/images/avt/0.png?1311)
71 + 65 x 4 = x + 140/x + 260
x + 140/x + 260 = 71 + 65 x 4
x + 140/x + 260 = 71 + 260
x + 140/x = 71
x/x + 140/x = 71
1 + 140/x = 71
140/x = 71 - 1
140/x = 70
x = 140/70
x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời:
71+65.4=x+140/x+260
x+140/x+260=71+65.4
x+140/x+260=71+260
x+140/x=71
x/x+140/x=71
1+140/x=71
140/x=71-1
140/x=70
x=140/70
x=2
vậy x=2
cậu ơi cái chỗ 71+65x4 là nhân 4 hay là 65 nhân x nhân 4 ạ