Question

Tolong nomor 15,17,18,20. trimss

Answer 1

15.
a-b=⅓
a+b=⅔
----------- (-)
-2b = -⅓
b = 1/6

a-b=⅓
a-1/6=⅓
a=2/6 + 1/6
a=½

ab = (1/2)(1/6) = 1/12 .... (B)

17.
4.000.000 x ¼ = 1.000.000
4.000.000 x 3/20 = 600.000
4.000.000 x ½ = 2.000.000

4.000.000-1.000.000-600.000-2.000.000 = 400.000 .... (B)

18.
∆/6 = 2/3
∆ = (2/3).6 = 12/3 = 4 .... (B)

Answer 2

15. a-b = 1/3
a = 1/3+b

a+b = 2/3
1/3+b+b= 2/3
2b = 2/3 - 1/3
2b = 1/3
b =1/3×1/2
b = 1/6

a = 1/3 + b
= 1/3 + 1/6
= 2/6 + 1/6
= 3/6
= 1/2

nilai ab = a×b
= 1/2× 1/6
= 1/12 (b)

17. 1/4 + 3/20 + 1/2 = 5/20 + 3/20 + 10/20
= 18/20 = 9/10

#cari bagian untuk lainnya
1 - 9/10 = 10/10 - 9/10 = 1/10

#jumlah uang untuk lainnya :
1/10 × 4000000 = 400.000
jadi, uang untuk lainnya adalah Rp400.000,00 (b)


18. ∆/6 = 2/3
∆ = 2/3×6
∆ = 4 (b)