\(a,\Leftrightarrow7-x=4:\dfrac{2}{3}\)
\(\Leftrightarrow7-x=6\)
\(\Leftrightarrow x=1\)
\(b,\Leftrightarrow4x^2=27.3\)
\(\Leftrightarrow4x^2=81\)
\(\Leftrightarrow x^2=20,25\)
\(\Leftrightarrow x=\dfrac{9}{2}\)
2/3 (7-x) = 4
= 7-x = 4: 2/3
= 7-x = 6
= x = 7-6
= 1
x2/3 = 27/4
=> x2 x 4 = 3 x 27
=> x2 x 4 = 81
=. x2 = 81 :4
=>x2 = 20,25
=>x2 = 4,52
=> x = 4,5
a)\(\dfrac{2}{3}\).(7-x) = 4
7-x = 4:\(\dfrac{2}{3}\)
7-x = 6
b)\(\dfrac{x^2}{3}\)=\(\dfrac{27}{4}\)
x\(^2\):3 = 27 :4
x\(^2\):3 = \(\dfrac{27}{4}\)
x\(^2\) = \(\dfrac{27}{4}\). 3
x\(^2\) = \(\dfrac{81}{4}\)
Vì x\(^2\)= \(\dfrac{81}{4}\) nên x= \(\dfrac{18}{4}\)
Tick mik vs!!!