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= (10x⁻⁶:2x) (y⁻³:y⁻⁵) (z²:z⁻³)
= (10:2(x⁻⁶⁻¹) (y⁻³⁺⁵) (z²⁺³)
= 5x⁻⁷ . y² . z⁵
8. Diagonal:
c²=a²+b²
c²= (√5-2)² + (√5-2)²
c²=(5 - 4√5 + 4) + (5- 4√5 + 4)
c²=18 - 8√5
c=√(18 - 8√5) cm
Keliling:
K=4s
= 4 (√5-2)
= 4√5 - 8 cm
Luas:
L=s²
= (√5 - 2)²
= (√5-2) (√5-2)
= 5 - 2√5 - 2√5 + 4
= 9 - 4√5 cm²
9. Luas permukaan:
Lp= 2pl + 2pt + 2lt
= 2(300√2+100√3(100√3-100)) + 2(300√2+100√3(3)) + 2(100√3-100(3))
= 2(30000√6 - 30000√2 + 30000 - 10000√3) + 2(900√2 + 300√3) +2(300√3-300)
= 60000√6 - 60000√2 + 60000 - 20000√3 + 1800√2 + 600√3 + 600√3 - 600
= 60000√6 - 18800√3 - 58200√2 + 59400cm²
Volume:
V= tpl
= 3 ((300√2+100√3) (100√3-100))
= 3 (30000√6 + 30000 - 30000√2 - 10000√3)
= 90000√6 - 30000√3 - 90000√2 + 90000 cm³
10. r=2^3/2 : 2
=3 : 2
=1,5 cm
L=πr²
=314/100 . (1,5)²
=314/100 . 225/100
=70650 / 10000
= 7,065 cm²