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1) x - 2 = -6
x = - 6 + 2
x = -4
2) -5x-(-3)=13
-5x+3=13
-5x=13-3=10
x=10:(-5)
x=-2
3) 15-(x-7)=21
15-x+7=21
15-x=21-7=14
x=15-14=1
4) 3x+17=2
3x=2-17=-15
x=-15:3=-5
5) 45-(x-9)=-35
45-x+9=-35
45-x=-35-9=-44
x=45-(-44)=89
6) -5+x=15
x=15-(-5)
x=20
7) 2x-(-17)=15
2x+17=15
2x=15-17=-2
x=-2:2=-1
a,\(\left(3x-4\right)\left(x-1\right)^3=0\)
\(=>\orbr{\begin{cases}3x-4=0\\x-1=0\end{cases}}\)
\(=>\orbr{\begin{cases}x=\frac{4}{3}\\x=1\end{cases}}\)
b,\(\left(x+1\right)+\left(x+2\right)+...+\left(x+100\right)=7450\)
\(=>x.100+\left(1+2+3+...+100\right)=7450\)
\(=>100x+5050=7450\)
\(=>100x=2400\)
\(=>x=24\)
-1/4-1/3:(3x)=-5
1/3:(3x)=-1/4+5
1/3:(3x)=19/4
(3x)=1/3:19/4
(3x)=4/57
x=4/57:3
x=4/171
vậy x=4/171
\(-\frac{1}{4}-\frac{1}{3}\div\left(3x\right)=-5\)
\(\frac{1}{3}\div\left(3x\right)=\frac{1}{4}+5\)
\(\frac{1}{3}\div\left(3x\right)=\frac{19}{4}\)
\(\left(3x\right)=\frac{1}{3}\div\frac{19}{4}\)
\(\left(3x\right)=\frac{4}{57}\)
\(x\)\(=\)\(\frac{4}{57}\div3\)
\(x\)\(=\) \(\frac{4}{171}\)
Chúc bạn học tốt !
\(5x-9=2x+15\)
\(\Leftrightarrow5x-2x=15+9\)
\(\Leftrightarrow3x=24\)
\(\Leftrightarrow x=8\)
\(3x-8⋮x-4\Rightarrow3\left(x-4\right)+4⋮x-4\)
\(\Rightarrow4⋮x-4\Rightarrow x-4\inƯ\left(4\right)=\left\{\pm1;\pm2;\pm4\right\}\)
\(\Rightarrow n\in\left\{5;3;6;2;8;0\right\}\)
Vậy...................