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Nomor 3 nya nggak tahu kak :V
nomor 3
luas kebun yang ditanami singkong
= 800 - ((1/4 +3/5) x 800)
= 800 - ((5/20 + 12/20) x 800)
= 800 - (17/20 x 800)
= 800 - 680
= 120 m^2
nomor 4
jarak sebenarnya
= 4 cm x 2.000.000 cm
= 8.000.000 cm
= 80 km
selamat belajar
~dhika~