Keliling sebuah persegi panjang 66 cm. jika panjang persegi panjang (5x - 2) cm dan lebrnya (4x - 1) cm, panjang dan lebar persegi panjang berturut-turut . . . . .
michelledanisa2
1/2 kell = 66 cm : 2 = 33cm 1/2 kell = p + l 5x - 2cm + 4x - 1 cm = 33 cm 9 x - 3 cm = 33 cm 9x = 33cm + 3 cm 9x= 36 cm x = 4cm panjang = 5x-2cm 5 × 4cm - 2 cm = 20 cm - 2 cm = 18 cm lebar= 4x-1cm 4×4cm - 1cm = 16 cm - 1 cm = 15 cm
1/2 kell = p + l
5x - 2cm + 4x - 1 cm = 33 cm
9 x - 3 cm = 33 cm
9x = 33cm + 3 cm
9x= 36 cm
x = 4cm
panjang = 5x-2cm
5 × 4cm - 2 cm = 20 cm - 2 cm = 18 cm
lebar= 4x-1cm
4×4cm - 1cm = 16 cm - 1 cm = 15 cm