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panjang foto = 80- 5 -5 =70
=> 55-x = 70
60 80
55-x = 60 × 70
80
55-x = 52,5
x = 55 - 52,5 = 2,5 cm (C)
23. pelurus sudut PQR
180 drajat = 114 drajat + X drajat
X drajat = 180 - 114 = 66 derajat
penyiku sudut PQR = 90 drajat - 66 drajat = 24 drajat ( C )
39. dadu = {1,2,3,4,5,6}=> 2,4,6
uang = { angka,gambar }=> angka
peluang = 3/12 = 1/4 (D)
38. SMA = 2/5 × 20 % = 8 %
SD / SMA => 40% / 8% = 900 / X
X = 8% × 900 / 40%
X = 180 anak ( B )