A = {[(5^2 - 3) x 4 - 16 :2 + 6^0] : 3} + 25 - 16 : 2^3
A = { [(52 _ 3 ) x 4 - 16 :2 + 60 ] : 3 } + 25 - 16 : 23
BÀI 4 . TÌM x
1 . X + 5 . 2 - { 32 + 16 . 3 : 6 } = 0
2 . { X -1 }^ 5 = 32
3 . { 2X - 3 }^ 2 = 25
tìm x,y,z
a) 12/16=-x/4 =21/y-z/80
b) 1/3 . x+2/5.(x-1)=0
c) (2.x-3).(6-2.x)=0
d)-2/3-1/3.(2.x-5)=3/2
e)(3.x-1).(-1/2.x+5)=0
f) (2.x+3/5)^2-9/25=0
giúp vS
5(x-3) = 70 - 45 =25
x- 3 =25 : 5 = 5 x = 5 +3 =8
x= 5 + 3 = 8
b) 10 + 2 . x = 4^2 =16
2 . x = 16 - 10 = 6
x = 6 : 2 = 3
\(5\left(x-3\right)=25\)
\(x-3=25:5=5\)
\(x=5+3=8\)
\(x-3=5=5x=8\)
Hình như sai đề
\(10+2x=16\)
\(2x=6\)
\(x=3\)
mik còn k pit bn hỏi cái dj
(Bài 14; Tìm x biết
1) x ^ 2 - 9 = 0
4) 4x ^ 2 - 4 = 0
7) (3x + I) ^ 2 - 16 = 0
10) (x + 3) ^ 2 - x ^ 2 = 45
2) 25 - x ^ 2 = 0
5) 4x ^ 2 - 36 = 0
8) (2x - 3) ^ 2 - 49 = 0
11) (5x - 4) ^ 2 - 49x ^ 2 = 0
3) - x ^ 2 + 36 = 0
6) 4x ^ 2 - 36 = 0
9) (2x - 5) ^ 2 - x ^ 2 = 0
12) 16 * (x - 1) ^ 2 - 25 = 0
1, \(x^2\) - 9 = 0
(\(x\) - 3)(\(x\) + 3) = 0
\(\left[{}\begin{matrix}x-3=0\\x+3=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)
vậy \(x\) \(\in\) {-3; 3}
7, (3\(x\) + 1)2 - 16 = 0
(3\(x\) + 1 - 4)(3\(x\) + 1 + 4) = 0
(3\(x\) - 3).(3\(x\) + 5) = 0
\(\left[{}\begin{matrix}3x-3=0\\3x+5=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}3x=3\\3x=-5\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=1\\x=\dfrac{-5}{3}\end{matrix}\right.\)
Vậy \(x\) \(\in\) {1; - \(\dfrac{5}{3}\)}
10, (\(x\) + 3)2 - \(x^2\) = 45
[(\(x\) + 3) - \(x\)].[(\(x\) + 3) + \(x\)] = 45
3.(2\(x\) + 3) = 45
2\(x\) + 3 = 15
2\(x\) = 12
\(x\) = 6
a) (2x-3)²=9
b) (x²-16)²-16(x-4)²=0
c) (2x/5-3/4)²-3x/5-1/4=0
d) 1/16(x-2)²=9/25(5/3x-5)²
a) 5√1,96 - 4√2,25 + 3√1,69
b) 1/3√49 + 3/4√324 - 2/3√400
c) 5/6√289 - 1/2√256 + 2/5√225
d) 15√16/25 + 12√9/16 - 18√16/81
a: =5*1,4-4*1,5+3*1,3
=7-6+3,9=4,9
b: =1/3*7+3/4*18-2/3*20
=7/3+54/4-40/3
=-11+54/4
=2,5
c: =5/6*17-1/2*16+2/5*15
=85/6-8+6
=85/6-2
=73/6
d: =15*4/5+12*3/4-18*4/9
=12+9-8
=12+1=13
Thực hiện các phép tính:
a)A=-4/5:6/5+3/4+1/2-(5/4:1/2)
b)B=2^5.8^4.4^3/16^6+2^3+(1/3)^2+(1/27)^0-3^5.(-25)^2/9^3.5^3
1, Thực hiện phép tính :
a,2^3 - 2^3 - 2^2 -( -2 )^2 +4^2 . (- 4) ^2
b, ( - 6 ) ^ 2 . (-2 )^ 3 +(-4 )^3 .(-4 )^2 +(-1 )^25 + (-1 )^26
c, 4^2 . (-25 )^ 4 :2^4 . 25 ^3
d, -2 ^3 .(-2)^4 : 2^6
2, tìm x thuộc Z biết :
a, x^2 -(-3 )^2 =16
b, x^2 + (-4) ^2 =0
c, ( x - 3 ). (x^2 -4 ) =0
(2^3-2^3)-(2^2-(-2)^2+(4^2*(-4)^2)=0-0+256=256
2, tìm x thuộc Z biết :
a, x^2 -(-3 )^2 =16
x^2-9 = 16
x^2 = 25
=> x = 5
b, x^2 + (-4) ^2 =0
x^2 + 16 = 0
x^2 = -16
=> x= -4