Question

$3,15:0,3+3( 2\frac{1}{2} - 0,75 *2 ) - ( \sqrt{5} - \frac{2,5}{ \sqrt{5} } ) * \sqrt{5} -2$

Answer 1

3,15=3 intregi   15/100= 3 intregi 3/20= 63/20

0,3=3/10

2 intregi 1/2= 5/2

0,75=75/100=3/4

√5=2,23= 2 intregi  23/100=  223/100

2,5=2 intregi  5/10= 2 intregi 1/2= 5/2   

63/20 * 10/3 +3 (5/2 -3/4 *2)-(5-2,5)/√5 * √5 -2=

21/2 +3( 5/2-3/2)- 2,5 -2=

21/2 +3* 2/2 - 5/2 -2=

=21/2+3-5/2 -2=

=16/2 +1= 

=8+1=9