Jawabanmu

2014-05-19T20:58:18+07:00
Keliling persegi = keliling persegi panjang
4(x+3) = 2{(2x-3)+(x-1)}
4x+12 = 2(3x-4)
4x+12 = 6x-8
-2x = -20
x=10

Sisi persegi = x+3 = 10+3 = 13cm
Panjang persegi panjang = 2x-3 = 2*10-3 = 17cm
Lebar persegi panjang = x-1 = 10-1 = 9cm
2014-05-19T20:59:20+07:00
Keliling persegi = kllg persegi panjang
4( x + 3) = 2(2x-3) + 2(x-1)
4x + 12 = 4x - 6 + 2x - 2
4x - 4x - 2x = -6 -2 -12
-2x = -20
x = 10
 jadi sisi persegi (x +3)
10 + 3 = 13 cm
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