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104 \(\times\) 125
= 13 \(\times\) 8 \(\times\) 125
= 13 \(\times\) (8 \(\times\) 125)
= 13 \(\times\) 1000
= 13 000
b, 22 \(\times\) 45
= 2 \(\times\) 11 \(\times\) 5 \(\times\) 9
= (2 \(\times\) 5) \(\times\) (11 \(\times\) 9)
= 10 \(\times\) 99
= 990
c, 50 \(\times\) 12
= 50 \(\times\) 2 \(\times\) 6
= 100 \(\times\) 6
= 600
d, 250 \(\times\) 16
= 250 \(\times\) 4 \(\times\) 4
= 1000 \(\times\) 4
= 4000
![](https://rs.olm.vn/images/avt/0.png?1311)
`a)53,2:(x-3,5)+45,8=99`
`53,2:(x-3,5)=99-45,8`
`53,2:(x-3,5)=53,2`
`x-3,5=53,2:53,2=1`
`x=1+3,5=4,5`
________________________________________
\(b)4,25\times(x+41,53)-125=53,5\)
\(4,25\times(x+41,53)=53,5+125=178,5\)
`x+41,53=178,5:4,25`
`x+41,53=42`
`x=42-41,53`
`x=0,47`
53,2:(x-3,5)+45,8=99
=> 53,2 :(x-3,5) = 99-45,8
=> 53,2 :(x-3,5) = 53,2
=> x-3,5= 53,2 : 53,2
=> x-3,5 = 1
=> x= 1+3,5
=> x= 4,5
câu còn lại tương tự nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{53,2:[x-3,5]+45,8=99}\)
\(\text{53,2:[x-3,5] =99-45,8}\)
\(\text{53,2:[x-3,5] =53,2}\)
\(\text{ x-3,5 =53,2:53,2}\)
\(\text{ x-3,5 =1}\)
\(\text{ x =4,5}\)
\(\text{4,25x[x+41,53]-125=53,5}\)
\(\text{4,25x[x+41,53] =53,5+125}\)
\(\text{4,25x[x+41,53] =178,5}\)
\(\text{ x+41,53 =178,5:4,25}\)
\(\text{ x+41,53 =42}\)
\(\text{ x =42+41,53}\)
\(\text{ x =83,53}\)
\(53,2\div\left(x-3,5\right)+45,8=99\)
\(53,2\div\left(x-35\right)=99-45,8\)
\(53,2\div\left(x-35\right)=53,2\)
\(x-35=1\)
\(x=1+35\)
\(x=36\)
\(4,25\times\left(x+41,53\right)-125=53,5\)
\(4,25\times\left(x+41,53\right)=53,5+125\)
\(4,25\times\left(x+41,53\right)=178,5\)
\(x+41,53=178,5\div4,25\)
\(x+41,53=42\)
\(x=42-41,53\)
\(x=0,47\)
![](https://rs.olm.vn/images/avt/0.png?1311)
45,8 x 8 + 45,8 x 2
= 45,8 x ( 8 + 2 )
= 45,8 x 10
= 458
45,8 x 8 + 45,8 x 2 = 45,8 x ( 8 + 2 )
= 45,8 x 10
= 458
![](https://rs.olm.vn/images/avt/0.png?1311)
53,2 : (x - 3,5 ) + 45,8 = 99
53,2 : (x - 3,5 ) = 99-45,8
53,2 : (x - 3,5 ) = 53,2
x-3,5=53,2:53,2
x-3,5=1
x=1+3,5
x=4,5
4,25 x ( X + 41,53 ) - 125 = 53,5
4,25 x ( X + 41,53 ) =53,5+125
4,25 x ( X + 41,53 ) =178,5
X + 41,53=178,5:4,25
X + 41,53=42
X=42-41,53
X=0,47
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 53,2 : ( x -3,5 ) + 45,8 =99
<=>53,2 : ( x -3,5 ) = 99 - 45,8
<=> 53,2 : ( x -3,5 ) = 53,2
<=> x - 3,5 = 53,2 : 53,2
<=> x -3,5 = 1
<=> x = 1 + 3,5
<=> x = 4,5
Vậy x =4,5
b) 4,25 . ( x + 41,53 ) - 125 = 53,5
<=> 4,25 .( x + 41,53 ) = 53,5 + 125
<=> 4,25 .( x + 41,53 ) = 178,5
<=> x + 41,53 = 178 : 4,25
<=> x + 41,53 = 42
<=> x = 42 - 41,53
<=> x = 0,47
Vậy x =0,47
a) \(53,2:\left(x-3,5\right)+45,8=99\)
\(\Leftrightarrow53,2:\left(x-3,5\right)=53,2\)
\(\Leftrightarrow x-3,5=1\)
\(\Leftrightarrow x=4,5\)
b) \(4,25\times\left(x+41,53\right)-125=53,5\)
\(\Leftrightarrow4,25\times\left(x+41,53\right)=178,5\)
\(\Leftrightarrow x+41,53=42\)
\(\Leftrightarrow x=0,47\)
125:50=2,5
45,8:12=3,82
789:12,3=64,15
98,5:45= 2,19
376:22,4=16,79