Diketahui keliling persegipanjang 64 cm dengan ukuran panjang (3x + 7) cm dan lebar (2x + 5) cm, maka panjang dan lebar persegi panjang berturut-turut adalah
azurazeeya
Keliling persegi panjang = 64 cm 2 (p + l ) = 64 cm 2 ((3x+7)cm + (2x+5)cm)=64 cm 2 (3x+2x+7+5) cm = 64 cm 2 (5x + 12) cm = 64 cm (10x + 24) cm = 64 cm 10x = 64 cm - 24 cm 10 x = 40 cm x = 40 cm / 10 x = 4 cm
p = (3x + 7) cm = 3.4 + 7 cm = 19 cm l = (2x + 5) cm = 2.4 + 5 cm = 13 cm
2 (p + l ) = 64 cm
2 ((3x+7)cm + (2x+5)cm)=64 cm
2 (3x+2x+7+5) cm = 64 cm
2 (5x + 12) cm = 64 cm
(10x + 24) cm = 64 cm
10x = 64 cm - 24 cm
10 x = 40 cm
x = 40 cm / 10
x = 4 cm
p = (3x + 7) cm = 3.4 + 7 cm = 19 cm
l = (2x + 5) cm = 2.4 + 5 cm = 13 cm