tìm x biết (x-1)x-x(x+3)=-48
Biết rằng x = 25 + 19. Tìm x?
A. x = 32 B. x = 1 C. x = 3 D. x = 33
Cho biết 48 ⋮ x, 30 ⋮ x, 66 ⋮ x và x lớn nhất thì
A. x = BCNN(48, 30, 66) B. x ∈ BC(48, 30, 66)
C. x = ƯCLN(48, 30, 66) D. x ∈ ƯC(48, 30, 66)
Bài 3: Tìm x, biết:
b) x x 48 = 490,1 - 125,33
c) 42,75 + x : 5 = 94,5
d) x - \(\dfrac{3}{4}\) + \(\dfrac{1}{4}\) = 3\(\dfrac{1}{3}\)
`@` `\text {Ans}`
`\downarrow`
`b)`
\(x\times48=490,1-125,33\)
\(x\times48=364,77\)
\(x=364,77\div48\)
\(x=7,599375\)
Vậy, `x = 7,599375`
`c)`
\(42,75+x\div5=94,5\)
`x \div 5= 94,5 - 42,75`
`x \div 5 = 51,75`
`x = 51,75 \times 5`
`x = 258,75`
Vậy, `x = 258,75`
`d)`
\(x-\dfrac{3}{4}+\dfrac{1}{4}=3\dfrac{1}{3}\)
\(x-\left(\dfrac{3}{4}-\dfrac{1}{4}\right)=\dfrac{10}{3}\)
\(x-\dfrac{2}{4}=\dfrac{10}{3}\)
\(x=\dfrac{10}{3}+\dfrac{2}{4}\)
\(x=\dfrac{23}{6}\)
Vậy, \(x=\dfrac{23}{6}\)
Tìm X biết: X + X x 3 = 48
X + X x 3 = 48
X x (1+3) = 48
X x 4 = 48
X = 48 : 4
X = 12
Tìm x, biết: x + x x 3 = 48
Tìm x, biết:
4 * 2^x42 - 2x = 480
(2x^2 + 1)*(x-3)=0
48-(15-x)^5=48
(2x2 + 1)(x-3)=0
\(\Rightarrow\orbr{\begin{cases}2x^2+1=0\\x-3=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x^2=-1\Rightarrow x^2=-\frac{1}{2}\left(vl\right)\\x=3\end{cases}}\)
Vậy x=3
48-(15-x)5=48
(15-x)5=48-48
(15-x)5=0
=> 15-x =0
x =15-0
x =15
Vậy x=15
Tìm số nguyên x biết :
1)x-43=(35-x)-48
2)-(x-6+85)=(x+51)-54
3)|-7-(x+3)|=3
\(x-43=35-x-48\)
\(x+x=43+35-48=30\)
2.x=30=> x=15
2) -x+6-85=x+51-54
-x-79=x-3
2x=76=> x=38
3)\(\orbr{\begin{cases}-7-x-3=-3\Rightarrow x=-7\\-7-x-3=3\Rightarrow x=-13\end{cases}}\)
Tìm X, biết :X + X x 3 = 48
X x 1 + X x 3 = 48
X x (1+3) = 48
X x 4 = 48
X = 48 : 4
X = 12
X + X * 3 = 48
x*1+x*3=48
x*(1+3)=48
x*4=48
x=12
\(\Rightarrow\) X x 1 + X x 3 = 48
\(\Rightarrow\) X x (1+3) = 48
\(\Rightarrow\) X x 4 = 48
\(\Rightarrow\)X = 48 : 4
\(\Rightarrow\) X = 12
Tìm x biết( x + 135 ) -( 48 -193 ) =1 - 2 - 3 - 4