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12 + ( 5 + x ) = 20 5.22 + ( x + 3 ) = 52 23 + ( x + 3 ) = 52 43 - ( x - 2 ) = 52
17 + x = 20 5.4 + x + 3 = 25 8 + x + 3 = 25 64 - x + 2 = 25
x = 20 - 17 20 + 3 + x = 25 11 + x = 25 66 - x = 25
x = 3 23 + x = 25 x = 25 - 11 x = 66 - 25
x = 25 - 23 x = 14 x = 41
x = 2
Đăng nhìu v bn :) Đáng quan ngại đây :)
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a) 7.x - x = 521 : 519 + 3.22 - 70
6x = 25 + 12 - 1
6x = 36
x = 6
b) 7x - 2x = 617 : 615 + 44 : 11
5x = 36 + 4
5x = 40
x = 8
c) 5x + x = 39 - 311 : 39
6x = 39 - 9
6x = 30
x = 5
d) [(6x - 39) : 7]. 4 = 12
(6x - 39) : 7 = 12 : 4
(6x - 39) : 7 = 3
6x - 39 = 3 . 7
6x - 39 = 21
6x = 21 + 39
6x = 60
x = 10
x =
Tìm x
\(\left(x-7\right)^3=\left(x-7\right)^5\)
\(\Rightarrow\left(x-7\right)^3-\left(x-7\right)^5=0\)
\(\left(x-7\right)^3\left[1-\left(x-7\right)^2\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(x-7\right)^3=0\\1-\left(x-7\right)^2=0\end{cases}}\)
+) \(\left(x-7\right)^3=0\Rightarrow x-7=0\Rightarrow x=7\)
+) \(1-\left(x-7\right)^2=0\)
\(\left(x-7\right)^2=1\)
\(\Rightarrow\orbr{\begin{cases}x-7=1\\x-7=-1\end{cases}}\Rightarrow\orbr{\begin{cases}x=8\\x=6\end{cases}}\)
Vậy \(x\in\left\{6;7;8\right\}\).