Question

toate punctele DAU COROANA SI 60 PUNCTE​

Answer 1

Răspuns:

Explicație pas cu pas:

a) √18 - 5√50 + 6√8 = 3√2 - 5·5√2 + 6·2√2 = (3-10+12)·√2 = 5√2

c) 3√2+√50-√32+√2⁷ = 3√2+5√2-4√2+8√2 = (3+5-4+8)·√2 = 12√2

e) √56 ·2√7 = 2√2·√7·2√7 = 4·7·√2 = 28√2

g) (√14 -√28)·√7 + 14 = (√2·√7 - 2√7)·√7 + 14 = 7√2-2·7+14 = 7√2

b) √80+√75-√125-9√5 = 4√5+3√7-5√5-9√5 = (4+3-5-9)·√5 = -7√5

d) √18·√12 = 3√2·2√3 = 6√6

f) (2/√5 + √5)·√5 = (2/√5)·√5 + √5·√5 = 2 + 5 = 7