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b:c=18:11
kita harus menyamakan b jd yg atas kita kali 9,yg bawah kali 2.diperoleh
a:b=63:36
b:c=36:22
jadi a:b:c= 63:36:22
b/c=18/11
samakan angka pada b=36
a/b=63/36 dan b/c = 36/22
a/b/c=63/36/22