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19 chia hết cho x
x \(\in\) Ư( 19 )
x \(\in\) { 1 ; 19 }
a) Ta có: \(19⋮x\)
\(\Leftrightarrow x\inƯ\left(19\right)\)
hay \(x\in\left\{1;-1;19;-19\right\}\)
Vậy: \(x\in\left\{1;-1;19;-19\right\}\)
b) Ta có: \(23⋮x+1\)
\(\Leftrightarrow x+1\inƯ\left(23\right)\)
\(\Leftrightarrow x+1\in\left\{1;-1;23;-23\right\}\)
hay \(x\in\left\{0;-2;22;-24\right\}\)
Vậy: \(x\in\left\{0;-2;22;-24\right\}\)
c) Ta có: \(12⋮x-1\)
\(\Leftrightarrow x-1\inƯ\left(12\right)\)
\(\Leftrightarrow x-1\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;12;-12\right\}\)
hay \(x\in\left\{2;0;3;-1;4;-2;5;-3;7;-5;13;-11\right\}\)
Vậy: \(x\in\left\{2;0;3;-1;4;-2;5;-3;7;-5;13;-11\right\}\)
Tìm xx biết: \left(x^{4}\right)^{3}=\dfrac{x^{19}}{x^{6}}(x4)3=x6x19
Trả lời: x=x=
a. (5.x + 3) : 4 – 16 = 6
(5.x + 3) : 4 = 22
(5.x + 3) = 88
5.x = 85
x = 13
b. 7(23 – 3.x) : 2 – 35 = 35
7(23 – 3.x) : 2 = 70
7(23 – 3.x) = 35
7 . 3.x = 12
7.x = 4
x = 4/7
a.) (5.x + 3) : 4 – 16 = 6
=> (5.x + 3) : 4 = 22
=> 5.x + 3 = 88
=> 5x = 85
=> x = 17
b) 7(23 – 3.x) : 2 – 35 = 35
=> 7(23 – 3.x) : 2 = 70
=>7(23 – 3.x) = 140
=> 23 – 3.x = 20
=> 3x = 3
=> x = 1
5(x-5)+35=??/ Đề sai
4(x+5)-35=-72
4(x+5)=-72+35
4(x+5)=-37
đề sai
5(x-5)+35=.
<=>(5+x)=35+5
<=>5+x=40
=>x=40-5=35
=>5(35-5)+3=158
b,4(x+5)-35=-72
<=>3x-30=-7
=>3x=23
=>x=23/3
\(23+\frac{x}{35}+x=\frac{4}{5}\)
\(\frac{x}{35}+x=\frac{4}{5}-23=-\frac{111}{5}\)
\(\frac{x}{35}+\frac{35x}{35}=-\frac{111}{5}\)
\(\Rightarrow\frac{x\left(35+1\right)}{35}=-\frac{111}{5}\)
\(\Rightarrow\frac{x.36}{35}=-\frac{111}{5}\)
\(\Rightarrow x.36.5=35.\left(-111\right)\)
\(\Rightarrow x.180=-3885\)
\(\Rightarrow x=-3885:180=-\frac{259}{12}\)
Học tốt~~~