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64 = 2(2x+3+x+8)
64÷2 = 3x + 11
32 = 3x + 11
32-11 = 3x
21 = 3x
x = 7
lebar = x+8 = 7+8 = 15 cm
(ini menurut saya)
64= 2p + 2l
64 = 2(2×+3) + 2(×+8)
64 = 4× + 6 + 2× + 16
64 = 4× + 2× + 6 + 16
64 = 6× + 22
64 - 22 = 6×
42 =6×
×= 42÷6
×=7
jadi x = 7
p = (2× + 3) = (2.7 + 3) = 17 cm
l = (× + 8) = (7 + 8) =15cm