Question

Calculați:
1. a) 3 (12√7 + 5)=
b) 2 (3√7 - 8) =
c) 2√3 (2√5 + √3) =
d) -2√5 (2√5 - 3√2) =

2. a) (12√3 - √75) : 7 =
b) (14√6 -√216) : (2√3) =

Answer 1

a)36√7+15
b)6√7-16
c)4√15+6
d)-20+6√10

Answer 2

1.a)3(12√7+5)=36√7+15
b)2(3√7-8)=6√7-16
c)2√3(2√5+√3)=4√15+2√9=4√15+2×3
=4√15+6
d)-2√5(2√5-3√2)=-4√25+6√10=-4×5+6√10
=-20+6√10

2.a)(12√3-√75):7
=(12√3-5√3):7
=7√3:7
=√3
b)(14√6-√216):(2√3)
=(14√6-6√6):(2√3)
=(8√6):(2√3)
=(4√6):(√3)
=4√18/3
=(4×3√2)/3
=12√2/3
=4√2