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maaf kalau salah, semoga membantu :)
1890 = (7x)(5x)(2x)
1890 = 70x³
x³ = 27
x = ³√27
x = 3 cm
Panjang 7x → 7(3) = 21 cm
Lebar 5(x) → 5(3) = 15 cm
Tinggi 2x → 2(3) = 6 cm