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a) . 7√5 + √20 = 7√5 + √4 *√5 = 7√5 + 2√5 = 9√5
b). = √16 * √2 - 3√2 = 4√2 - 3√2 = √2
c). = √9 * √2 + √4 * √2 = 3√2 + 2√2 = 5√2
d) = √100 * √2 - √25 * √2 = 10√2 - 5√2 = 5√2
e) = √9 * √2 + √36 * √2 + √49 * √2 = 3√2 + 6√2 + 7√2 = 16√2
f) = √400 * √2 + √121 * √2 - √81 * √2 = 20√2 + 11√2 - 9√2 = 22√2
zad.2
a 7√5+√20 = 7√5 + √(4*5) = 7√5 + 2√5 = 9√5
b √48-√3 = √(16*3) - √3 = 4√3 -√3=3√3
c √12+√27 = √(4*3) + √(9*3) = 2√3 + 3√3 = 5√3
d √45-√125 =√(9*5) - √(25*5) = 3√5 - 5√5 = -2√5
e 0,2√50+0.8√72-0.3√32 = 0,2√(25*2) + 0,8√(36*2) - 0,3√(16*2) = =√2+ 4,8√2 - 1,2√2 = 4,6√2
f 3√20-1/3√45-5√180 = 3√(4*5) - 1/3√(9*5) - 5√(36*5) = = 6√5 - √5 - 30√5 = -25√2