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misal :
mobil = b
motor = a
3b + 2a = 11.000 | dikali 1 | 3b + 2a = 11.000
2b + 1a = 7.000 | dikali 2 | 4b + 2a = 14.000 _
-b = -3000
b = 3000
6000 + a = 7000
a = 1000
b + 2a = 3000 + 2000 = 5000 (B)
#18
12² = (5x)²-(4x)
144 = 25x² - 16x²
144 = 9x²
16 = x²
4 cm = x
L Δ = 12 x 4 x 4 / 2 = 96 cm2 (B)
#19 maaf bingung
#20
banyak air mancur = kel taman / jarak = 22/7 x 21 / 1,5 = 44 buah (D)
Karena Tarif 1 mobil = Rp 3.000,00
Tarif 1 motor = Rp 1.500,00 x 2 = Rp 3.000,00