Oblicz .
2 √45 + 3√20 - √80 =
∛40 + ∛135 =
√90 + √40 + √250 =
√18 - 2√8 =
3√20 + √5 =
2√48 + 2√3 =
1. Uzupełnij ;
√... = 13
√... = ¼
√... = 0,1
∛... = 0,1
∛... = -5
∛... = -⅔
∛... = 1⅓
2. Uzupełnij.
a.) √36 · √144 =
√9 · √... = 21
√... ÷ √25 = 2
b.) ∛27 · ∛-8 = ...
∛64 · ∛... = 40
∛125 ÷ ∛... = -5
c.) √121 · ∛-27 = ...
∛216 · √... = 36
√196 ÷ ∛... = -7
3. Wpisz znak < lub > .
a.) √31 5
√47 7
√99 9
b.) √90 9
∛70 9
∛-10 -1
z góry b. dziękuje . ; *
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Zad 1.
2 √45 + 3√20 - √80 =2√3²×5 + 3√2²×5 + √2²×2²×5=6√5 + 6√5 + 4√5=16√5
∛40 + ∛135 =∛2³×5 + ∛3³×5 = 2∛5 + 3∛5 = 5∛5
√90 + √40 + √250 =√3²×2×5 + √2²×2×5 + √5²×2×5 = 3√10 + 2√10 + 5√10 = 10√10
√18 - 2√8 =√3²×2 - 2√2²×2 = 3√2 - 4√2 = -√2
3√20 + √5 = 3√2²×5 + √5 = 6√5 + √5 = 7√5
2√48 + 2√3 = 2√2²×2²×3 + 2√3 = 8√3 + 2√3 = 10√3
Zad.3
a.) √31 > 5
√47 > 7
√99 < 9
b.) √90 < 9
∛70 < 9
∛-10 > -1