2. 2√80 + √45 – 2√125 =?
3. 3√75 – 4√20 – √80=?
4. √8 – 2√27 + 5√18 =?
minta tolong jawabannya + cara jalannya(rumus) trims
1. √50 – √8 + √18 =?
1.
√50 – √8 + √18
= √(25×2) – √(4×2) + √(9×2)
= 5√2 – 2√2 + 3√2 = 6√2
2.
2√80 + √45 – 2√125
= 2√(16×5) + √(9×5) – 2√(25×5)
= 8√5 + 3√5 – 10√5 = √5
3.
3√75 – 4√20 – √80
= 3√(25×3) – 4√(4×5) – √(16×5)
= 15√3 – 8√5 – 4√5 = 15√3 – 12√5
4.
√8 – 2√27 + 5√18
= √(4×2) – 2√(9×3) + 5√(9×2)
= 2√2 – 6√3 + 15√2 = 17√2 – 6√3
1. √50 – √8 + √18
= √25 x √2-√4 x √2+√9 x √2
= 5√2 – 2√2 + 3√2
= (5-2+3) √2
= 6√2
2. 2√80 + √45 – 2√125
= 2√16×5 + √9×5 – 2√25×5
= 2 x 4√5 + 3√5 – 2 x 5√5
= 8√5 + 3√5 – 10√5
= (8+3-10) √5
= 1√5
3. 3√75 – 4√20 – √80
= 3√25×3 – 4 x √4×5 – √16×5
= 3×5√3 – 4×2√5 – 4√5
= 15√4 – 8√5 – 2√5
= 15√4 – (8-2) √5
= 15√4 – 6√5
4. √8 – 2√27 + 5√18
= √4×2 – 2√9×3 + 5√9×2
= 2√2 – 2 x 3√3 + 5 x 3√2
= 2√2 – 6√3 + 15√2
= (2+15) √2 – 6√3
= 17√2 – 6√3