Question

Cat face 2√18·(√32 - √2)=????
Dar 20 + 30   - 35        =????         (acolo unde spatiul de sub ele e linie de fractie !)
     √20  √180  √245

Answer 1

rezolvarea primei  probleme este urmatoarea:( 2^4=2 la puterea a 4-a)

2√18(√32-√2)=2√(2*3^2)*(√(2*2^4)-√2)=

=2*3V2*(2²*√2-√2)=

=2*3√2*√2(2²-1)=

=2*3*2*3=

=36

A doua problema:

20/√20+30/√180-35/√245=

20/√(2²*5)+30/V(3²*2²*5)-35/√(7²*5)=

20/2√5+30/(3*2*√5)-35/(7√5)=

10/√5+5/√5-5/√5=

(10+5-5)/√5=10/√5=(10√5)/5=2√5