December 2019 1 39 Report
Keliling sebuah persegi panjang = (4x + 24) cm. Lebar persegi panjabg = (6 - x) cm. Agar luasnya maksimum, maka panjangnya adalah ...
A. 8 cm
B. 10 cm
C. 12 cm
D. 18 cm​

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