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a) \(x+\frac{1}{2}=\frac{3}{4}\Rightarrow x=\frac{3}{4}-\frac{1}{2}\)\(\Rightarrow x=\frac{1}{4}\)
b)\(\frac{4}{5}\cdot x=\frac{4}{7}\Rightarrow x=\frac{4}{7}:\frac{4}{5}\)\(\Rightarrow x=\frac{5}{7}\)
c) \(8x=7,8x+25\Rightarrow8x-7,8x=25\)\(\Rightarrow0,2x=25\Rightarrow x=\frac{25}{0,2}\Rightarrow x=125\)
a. x+1/2=3/4
x =3/4 - 1/2
x = 1/4
b. 4/5.x=4/7
x =4/7 : 4/5
x = 4/7 . 5/4
x = 5/7
c. 8x=7,8+25
8x=32,8
x= 32,8 : 8
x= 4,1
a) x=\(\frac{3}{4}-\frac{1}{2}\)
=\(\frac{1}{4}\)
b)x\(=\frac{4}{7}:\frac{4}{5}\)
x\(=\frac{4}{7}.\frac{5}{4}\)
x\(=\frac{5}{7}\)
c)8x= 32,8
x=4,1
x+1/2=3/4
x=3/4-1/2
x=6/8--4/8
x=2/8=1/4
4/5.x=4/7
x=4/7:4/5
x=4/7.5/4
x=5/7
a) \(\left(x+2\right)^2=25\)
\(\Rightarrow\left(x+2\right)^2=5^2\)
\(\Rightarrow\left[{}\begin{matrix}x+2=5\\x+2=-5\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-7\end{matrix}\right.\)
b) x chia hết cho 7
⇒ \(x\in B\left(7\right)=\left\{0;7;14;21;28;35;42;49;56;...\right\}\)
Mà: \(15< x< 56\)
\(\Rightarrow x\in\left\{21;28;35;42;49\right\}\)
a: =>x+2=5 hoặc x+2=-5
=>x=-7 hoặc x=3
b: x chia hết cho 7
=>x thuộc {0;7;14;21;28;35;42;49;56;63}
mà 15<x<56
nên x thuộc {21;28;35;42;49}
1/2 - (2/3x - 1/3) = 2/3
=> 1/2 - 2/3x + 1/3 = 2/3
=> 5/6 - 2/3x = 2/3
=> 2/3x = 5/6 - 2/3
=> 2/3x = 1/6
=> x = 1/6 : 2/3
=> x = 1/4
8x = 7,8x + 25
=> 8x - 7,8x = 25
=> 0,2x = 25
=> x = 25 : 0,2
=> x = 125
\(\frac{1}{2}-\left(\frac{2}{3}x-\frac{1}{3}\right)=\frac{2}{3}\)
\(\frac{1}{2}-\frac{2}{3}x+\frac{1}{3}=\frac{2}{3}\)
\(-\frac{2}{3}x=-\frac{1}{6}\)
\(x=\frac{1}{4}\)
\(8x=7,8x+25\)
\(02,x=25\)
\(x=125\)
=.= hk tốt!!
\(7,8.x+25=8x\)
\(\Rightarrow8x-7,8x=25\)
\(\Rightarrow0,2x=25\Rightarrow x=125\)
Vậy x= 125