Question

Tolong dibantu dink no 7 , 8 dan 9 pake cara dan jawaban yg benar .Dikit kok he

Answer 1

7. 27^(2/3) - 32^(4/5) + 25^(1 1/2)
= (3^3)^(2/3) - (2^5)^(4/5) + (5^2)^(3/2)
= 3^2 - 2^4 + 5^3
= 9 - 16 + 125
= 118

8. L = pl
L = (5 + √3)(5 - √3)
L = 25 - 5√3 + 5√3 - 3
L = 22 cm²

9a. 2/√8
= 2/(2√2)
= 1/√2 × √2/√2
= √2/2

9b. 8/(√5 + 3)
= 8/(√5 + 3) × (√5 - 3)/(√5 - 3)
= [8(√5 - 3)]/[(√5)² - 3²]
= [8(√5 - 3)]/(5 - 9)
= [8(√5 - 3)]/(-4)
= -2(√5 - 3)
= 6 - 2√5