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\(\frac{1}{6}=\frac{x}{18}\Rightarrow x=3\)
\(\frac{x}{8}=-\frac{1}{4}\Rightarrow x=-2\)
\(\frac{4}{-5}=\frac{x}{10}\Rightarrow x=-8\)
\(\frac{11}{5}=-\frac{22}{x}\Rightarrow x=-10\)
\(\frac{x}{8}=\frac{8}{x}\Rightarrow x^2=64\Rightarrow x=8\)
\(\frac{x}{-11}=-\frac{11}{x}\Rightarrow x^2=121\Rightarrow x=11\)
#H
1.a)x+7=-5-14
x+7=-19
x=-19-7
x=-26
Vậy x=-26
b)3x-4=(-2)3-11
3x-8=-11
3x=-11+8
3x=-3
x=-3:3
X=-1
Vậy x=-1
c)11+(4x-11)=-9-(-15)
11+(4x-11)=-9+15
11+(4x-11)=6
4x-11=6-11
4x=6
x=\(\dfrac{6}{4}\)
Vậy x=\(\dfrac{6}{4}\)
d)\(\left|2x-1\right|=5\)
⇒2x-1=\(\pm5\)
+Nếu 2x-1=5
2x=6
x=6:2
x=3
Vậy x=3
+Nếu 2x-1=-5
2x=-5+1
2x=-4
x=-4:2
x=-2
Vậy xϵ{3;-2}
e)\(\left|x-7\right|+3=25\)
\(\left|x-7\right|=22\)
⇒x-7=\(\pm22\)
+Nếu x-7=22
x=22+7=29
+Nếu x-7=-22
x=-22+7
x=-15
Vậy xϵ{29;-15}
\(11\cdot\left(x-6\right)=4x+11\)
\(11x-66=4x+11\)
\(11x-4x=11+66\)
\(7x=77\)
\(\Rightarrow x=11\)
\(11.\left(x-6\right)=4x+11\)
=) \(11x-66=4x+11\)
=) \(11x-4x=11+66\)
=) \(7x=77\)
=) \(x=77:7=11\)
b ) \(2017-69.\left(11-x\right)=2^7:2^3\)
\(2017-69.\left(11-x\right)=2^4\)
\(2017-69.\left(11-x\right)=16\)
\(69.\left(11-x\right)=2017-16\)
\(69.\left(11-x\right)=2001\)
\(\left(11-x\right)=2001:69\)
\(11-x=29\)
\(x=11-29\)
\(x=-18\)
Vậy \(x=-18\)
Chúc bạn học tốt !!!
a ) \(20:\left(2x-3\right)=4\)
\(\left(2x-3\right)=20:4\)
\(2x-3=5\)
\(2x=5+3\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
Vậy \(x=4\)
\(\frac{4}{11}< \frac{x}{20}< \frac{5}{11}\Rightarrow\frac{80}{220}< \frac{11.x}{220}< \frac{100}{220}\)
\(\Rightarrow80< 11.x< 100\)
\(\Rightarrow11.x\in\left\{88;99\right\}\)
\(\Rightarrow x\in\left\{8;9\right\}\)