Question

Упростите выражение:
1) 2√2+√50-√98 2)(3√5-√20)√5.

Answer 1

1)2√2+5√2-7√2=0
2)(3√5-2√5)*√5=√5*√5=5

Answer 2

1)2√2+√50-√98=2√2+√(25.2) -√(49.2)=2√2+√25.√2-√49.√2=
=2√2+5√2-7√2=(2+5-7)√2=0.√2=0

Answer 3

2)(3V5-V(20)).V5=(3V5-2V5).V5=(3-2)V5.V5=V5.V5=5