1. 890 : x =35 dư 15
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\(890:x=35\left(dư15\right)\)
\(\Rightarrow x=\frac{\left(890-15\right)}{35}=25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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Ta có: \(890:x=35\) (dư 15)
\(\Rightarrow\left(890-15\right):35=x\)
\(\Rightarrow875:35=x\)
\(\Rightarrow x=25\)
Vậy x = 25
890 : x = 35 dư 15
890 = 35x + 15
890 - 15 = 35x
875 = 35x
875 : 35 = x
=> x = 25
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![](https://rs.olm.vn/images/avt/0.png?1311)
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890 : x = 35 dư 15
x = (890 - 15) : 35
x = 25
1482 : x + 23 = 80
1482 : x = 80 - 23
1482 : x = 57
x = 1482 : 57
x = 26
15 - 5 x (x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x (x - 1) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 618
x = 103
890 : x = 35 ( dư 15 )
x = ( 890 - 15 ) : 35
x = 25
1482 : x + 23 = 80
1483 : x = 80 - 23
1483 : x = 57
x = 1483 : 57
x = 26
15 - 5 x ( x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x ( x - 1 ) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 118
x = 118
Lời giải:
$890=x\times 35+15$
$890-15=x\times 35$
$875=x\times 35$
$x=875:35=25$