(-24) . x = -120
x - (28 - x) = x - 24x−(28−x)=x−24.
Tìm số nguyên x, biết:
a) \(\left( { - 24} \right).x = - 120\)
b) \(6.x = 24\)
a)
\(\begin{array}{l}\left( { - 24} \right).x = - 120\\ \Leftrightarrow x = - 120:\left( { - 24} \right)\\ \Leftrightarrow x = 5\end{array}\)
Vậy x =5
b)
\(\begin{array}{l}6.x = 24\\ \Leftrightarrow x = 24:6\\ \Leftrightarrow x = 4\end{array}\)
Vậy x= 4
Tìm x thuộc số tự nhiên
1440 : [120-(3.x9) ] =120
120 + [ ( 999-9.x) : 60 ] . 24=480
\(1440:\left[120-\left(3.9x\right)\right]=120\) \(120+\left[\left(999-9x\right):60\right].24=480\)
\(120-\left(3.9x\right)=1440:120\) \(\left[\left(999-9x\right):60\right].24=360\)
\(120-\left(3.9x\right)=12\) \(\left(999-9x\right):60=15\)
\(3.9x=120-12\) \(999-9x=900\)
\(3.9x=108\) \(9x=999-900\)
\(9x=108:3\) \(9x=99\)
\(9x=36\) \(x=99:9\)
\(x=4\) \(x=11\)
24/120=x/5
`24/120 = x/5`
`24/120 = (24 \div 24)/(120 \div 24) = 1/5`
`-> 1/5 = x/5`
`-> x=1`
Vậy, `24/120 = 1/5.`
\(\dfrac{24}{120}=\dfrac{x}{5}\)
\(\dfrac{24:24}{120:24}=\dfrac{x}{5}\)
\(\dfrac{1}{5}=\dfrac{x}{5}\)
\(\dfrac{1}{5}=x:5\)
\(x=5\times\dfrac{1}{5}\)
\(x=1\)
\(\dfrac{24}{120}=\dfrac{x}{5}\)
\(\Leftrightarrow\dfrac{24:24}{120:24}=\dfrac{x}{5}\)
\(\Leftrightarrow\dfrac{1}{5}=\dfrac{x}{5}\)
\(\Rightarrow x=1\)
24/120=x/5
21 x 22 x 23 x 24 x a = 127*120 ; * = ......................?
a=5 \(\Rightarrow\)*=5 vì 21.22.23.24.5=1275120
1. Phép chia 24 650 : 120
A. 24 650 : 120 = 25 (dư 50) C. 24 650 : 120 = 25 (dư 5)
b. 24 650 : 120 = 205 (dư 50) D. C. 24 650 : 120 = 205 (dư 5)
2880 : [120 - ( x - 5 )] = 24
=> 120 - (x - 5) = 2880 : 24 = 120
=> x - 5 = 120 - 120 = 0
=> x = 0 + 5 = 5
2880 : [120 - ( x - 5 )] = 24
120 - ( x - 5 ) = 2880 : 24
120 - ( x - 5 ) = 120
x - 5 = 120 - 120
x - 5 = 0
x = 0 + 5
x = 5
1. Phép chia 24 650: 120
A. 24 650: 120 = 25 (dư 50) C. 24 650: 120 = 25 (dư 5)
b. 24 650: 120 = 205 (dư 50) D. C. 24 650: 120 = 205 (dư 5)
giúp mình nha