
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.


Câu 1:72.(-2)2+(-2) 2 .28
= (-2)2 . ( 72 + 28 )
= 4 . 100
= 400
Câu 2: (-25).(75-45)-75.(45-25)
= (-25) . 75 + 25 . 45 - 75 . 45 + 75 . 25
= 25 . 45 - 75 . 45
= 45 . ( 25 - 75 )
= 45 . -50
= -2250
Câu 3:a+1 là ước của 5
\(\Rightarrow\)a + 1 \(\in\){ 1 ; -1 ; 5 ; -5 }
\(\Rightarrow\)a \(\in\){ 0 ; -2 ; 4 ; -6 }
Vậy a \(\in\){ 0 ; -2 ; 4 ; -6 }
~ HOK TỐT ~

=9x2^25-2^2x2^26/2^24x5^2-2^27x3
=9x2^25-2^28/2^24x5^2-2^27x3
=2^25x(9-2^3)/2^24x(5^2-2^3x3)
=2^25/2^24
=2^1=2


2(x-51) =2.2 mũ 3 + 20
2(x-51) =2.8+20
2(x-51) =16+20
2(x-51) =36
x-51 =36:2
x-51 =18
x =18+51
x =69
2. (x - 51) = 2. 23 + 20
2. (x - 51) = 16 + 20
2. (x - 51) = 36
(x - 51) = 36 : 2
(x - 51) = 18
x = 18 + 51
x = 69

\(2^{x+1}-2^x=3^2\)
\(\Rightarrow2^x\cdot\left(2-1\right)=9\)
\(\Rightarrow2^x=9\)
\(\Rightarrow x\in\varnothing\)
\(2^{x+1}-2^x=3^2\)
=>2^x*2-2^x=9
=>2^x=9
=>\(x\in\varnothing\)

\(142-\left[50-\left(2^3×10-2^3×5\right)\right]\)
\(=142-\left[50-\left(8×10-8×5\right)\right]\)
\(=142-\left[50-\left(80-40\right)\right]\)
\(=142-\left[50-40\right]\)
\(=142-10\)
\(=132\)
142-[50-(8 x 10 - 8 x5)]
142-{50-[8 x(10-5)}
142-{50-8 x 5}
142-{50-40}
142-10
132
(x+2)2=25
(x+2)2=52
x+2=5
x=5-2
x=3
(x+2)2=25
(x+2)2=52 hay (x+2)2=(-5)2
x+2=5 hay x +2=-5
x=5-2 hay x=-5-2
x=3 hay x=-7
Nãy là mik làm lộn nhé Ngô võ Ngọc phương.Bây giờ mới đúng nè