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2x+1-3=13
2x+1=13+3
2x+1=16
2x+1=24
Vậy x+1=4
x=4-1=3
Vậy x=3
* = 1 ; 2 ; 3 ; 4 5 ; 6 ; 7 ; 8 ; 9 ; 0
b/ 120 - x : 4 = 34 : 311
120 - x : 4 = 37
120 - x : 4 = 2187
x : 4 = 120 - 2187
x : 4 = -2067
=> x = -8268
a) 3*2 có tận cùng là 2 nên chia hết cho 2
vậy * = 0;1;2 ... 9
b) 120 - x : 4 = \(3^4:3^{11}\)
120 - x : 4 = \(-\left(3^7\right)\)
x : 4 = 120 - \(\left[-\left(3^7\right)\right]\)
x : 4 = 2307
x = 2307 x 4
x = 9228
a) 5x.(-x)2 + 1 = 6
<=> 5x.x2 = 5
<=> 5x3 = 5
<=> x3 = 1
<=> x = 1
b) 4.x3 = 4x
4x3 - 4x = 0
4x.(x2 - 1) = 0
\(\Leftrightarrow\orbr{\begin{cases}4x=0\\x^2-1=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x^2=1\end{cases}}\)
Với \(x^2=1\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=-1\end{cases}}\)
c) xy = x + y
x + y - xy = 0
x + y - xy - 1 = 0
(x - xy) - (1 - y) = 0
x(1 - y) - (1 - y) = 0
(x - 1)(1 - y) = 0
\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\1-y=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=1\\y=1\end{cases}}\)
d) Tương tự
đề bài là gì vậy bạn uiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
Thui mình giải đại nhennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
=(x+x+x)+(1/2+2/3+3/6)
=3x+(3/6+4/6+3/6)
=3x+15
Hết ùiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
Bye nhennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn