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72 × 9 = y × 5
648 = 5y
129,6 = y
Jawaban lain jika soalnya yang salah.
72 : y = 9 : 5
72 × 5 = y × 9
360 = 9y
40 = y
5. Keliling Persegi Panjang = p × l = 125 × 100 = 12500
Perbandingan Panjang Dan Keliling = 125 : 12500 = 1 : 100