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bn ns j mik k hỉu lun đó
gửi câu hỏi lại đi nha
nếu ai đồng ý vs ý kiến của mikk
thì ủng hộ mik nha
![](https://rs.olm.vn/images/avt/0.png?1311)
nè, Nhi tưởng 65x4 thì dấu "x" phải là nhân mới đúng chứ, nếu là x thì sao giải đc.
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420 + 65x4 = ( x + 175) : 5 + 30
420 + 260 = x : 5 + 175 : 5 + 30
680 = x : 5 + 35 + 30
680 - 30 = x : 5 + 35
650 = x : 5 + 35
650 - 35 = x : 5
615 = x : 5
615 x 5 = x
3075 = x
b) ( 32 x 15) : 2 = ( x + 70):14 - 40
480 : 2 = x : 14 + 70 : 14 - 40
240 = x : 14 + 5 - 40
240 + 40 = x : 14 + 5
280 = x: 14 + 5
280 - 5 = x : 14
275 = x : 14
275 x 14 = x
3850 = x
c) x - 4867 = ( 175 x 2050 x 70) : 25 + 23
x - 4867 = 25 112 500 : 25 + 23
x - 4867 = 1004500 + 23
x - 4867 = 1004523
x = 1004523 + 4867
x = 1008390
![](https://rs.olm.vn/images/avt/0.png?1311)
420 + 65.4 = (x+175) : 5 + 30
=> 420 + 260 = (x + 175) : 5 + 30
=> 680 = (x + 175) : 5 + 30
=> 680 - 30 = (x + 175) : 5
=> 650 = (x + 175) : 5
=> x + 175 = 650 . 5 = 3250.
=> x = 3250 - 175
=> x = 3075.
(32 . 15) : 2 = (x + 70) : 14 - 40
=> 480 : 2 = (x + 70) : 14 - 40
=> 240 = (x + 70) : 14 - 40
=> x + 70 = 240 + 40 = 280
=> x = 280 - 70 = 210
\(420+65.4=\left(x+175\right):5+30\)
\(420+260=\left(x+175\right):5+30\)
\(680-30=\left(x+175\right):5\)
\(650=\left(x+175\right):5\)
\(650.5=x+175\)
\(3250=x+175\)
\(x=3075\)
vay \(x=3075\)
\(\left(32.15\right):2=\left(x+70\right):14-40\)
\(480:2=\left(x+70\right):14-40\)
\(240+40=\left(x+70\right):14\)
\(280=\left(x+70\right):14\)
\(280.14=x+70\)
\(3920=x+70\)
\(3850=x\)
vay \(x=3850\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 420 + 65.4 = (x+175):5+30 b) x - 4867 = (175.2050.70):25+23
(x+175):5+30 = 420 + 65.4 x - 4867 = 1004523
(x+175):5+30 = 680 x = 999656
(x+175):5 = 650
x+175 = 3250
x = 3075
![](https://rs.olm.vn/images/avt/0.png?1311)
a, x + 350 : x = 93 - 45 : 2
=> x + 350 : x = 93 - 22,5
=> x + 350 : x = 70,5
=> ?
![](https://rs.olm.vn/images/avt/0.png?1311)
420+65.4=(x+175):5+30
=> 420 + 260 = ( x + 175 ) : 5 + 30
=> 680 = ( x + 175 ) : 5 + 30 <=> ( x + 175 ) : 5 + 30 = 680
=> ( x + 175 ) : 5 = 650
=> x + 175 = 3250
=> x = 3075
420+65.4=(X+175):5+30
=>420+260=(X+175):5+30
=>680=(X+175):5+30
=>680-30=(X+175):5
=>650=(X+175):5
=>650.5=X+175
=>3250=X+175
=>X=3250-175
=>X=3075
![](https://rs.olm.vn/images/avt/0.png?1311)
( X + 175 ) : 5 + 30 =420 + 65 x 4
( X + 175 ) : 5 + 30 = 680
( X + 175 ) : 5 = 680 - 30 = 650
( X + 175 ) = 650 x 5 = 3250
X = 3250 - 175 = 3075
( X + 175 ) : 5 + 30 = 420 + 65 x 4
( X + 175 ) : 5 + 30 = 420 + 260
( X + 175 ) : 5 + 30 = 680
( X + 175 ) : 5=680-30
( X + 175 ) : 5=650
X + 175=650x5
X + 175=3250
X=3250-175
X=3075
![](https://rs.olm.vn/images/avt/0.png?1311)
(5^2.x+175):5+30=420+260
<=>(5^2.x+175):5=650
<=>5^2.x+175=3250
<=>25.x=3075
<=>x=123
( 52 . x + 175 ) : 5 + 30 = 420 + 65 . 4
= ( 25 . x + 175 ) : 5 + 30 = 420 + 260
( 25 . x + 175 ) : 5 + 30 = 680
( 25 . x + 175 ) : 5 = 680 - 30
( 25 . x + 175 ) : 5 = 650
25 . x + 175 = 650 . 5
25 . x + 175 = 3250
25 . x = 3250 - 175
25 . x = 3075
x = 3075 : 25
x = 123
\(420+65\times4=\frac{x+175}{5}+30\)
\(\frac{x+175}{5}=420+260-30\)
\(\frac{x+175}{5}=650\)
\(x+175=650\times5\)
\(x+175=3250\)
x = 3250 - 175
x = 3075
a)420+65x4=(x+175):5+30
420+260=(x+175):5+30
680=(x+175):5+30
680-30=(x+175):5
650=(x+175):5
650x5=x+175
3250=x+175
x=3250-175
x=3075