yg bisa jawab dong..

1) 9√2 × √48 ÷ √54
= 9√2 × 4√3 ÷ 3√6
= 36√6 ÷ 3√6
= 12 ( C )

2) U1 = a = 3
U2 = 5
Un = a + ( n - 1 ) b
U2 = a + ( 2 - 1 ) b
5 = 3 + b
b = 5 - 3
b = 2
U15 = a + 14b
= 3 + 14 ( 2 )
= 3 + 28
= 31 ( A )

4) HJ= 2.400.000
laba = 20%
misal HB = 100%
maka HJ = 100% + 20% = 120%
HB = 100%/120% × 2.400.000
= 5/6 × 2.400.000
= 2.000.000 ( C )

5) K = 2 × ( p + l )
= 2 × ( 45 + 35 )
= 2 × 80 m
= 160 m
panjang kawat
= 3 × 160 m
= 480 m ( C )