Question

Calculati :

a) √0,8+2√1.8-8√0,2

 b) √3.38 - √0,98-√5,12

c) 0,5√7+0,3√28-1,7√63

d) 5√3-1supra 2√27+1,5√3

Answer 1

a) √0,8+2√1.8-8√0,2=√8/10+2√18/10-8√2/10=√80/10+2√180/10-8√20/10=4√5/10+2*6√5/10-8*2√5/10=0/10=0

b) √3.38 - √0,98-√5,12=√338/100 - √98/100-√512/100=√338/10 - √98/10-√512/10=13√2/10-7√2/10-16√2/10=-10√2/10=-√2

c) 0,5√7+0,3√28-1,7√63=0,5√7+0,3*2√7-1,7*3√7=0,5√7+0,6√7-5,1√7=-4√7

d) 5√3-1/ 2√27+1,5√3=5√3-1/ 6√3+1,5√3=16-√3/ 18+1,5*3/3=16-√3/ 18+1,5*3*6/18=16-√3/ 18+27/18=43-√3/18