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5:4
selisih usia = 5-4
5+4 ×45
1/9×45=9
jadi selisih umur mereka adalah 9 tahun
14.p=5
l=3
1:1.500
p=5×1500=7.500(75 m)
l=3×1500=4.500 (45m)
p×l
75×45=3.375m^2