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78 = 2(3x-2) + 2(2x+1)
78 = 6x-4 + 4x + 2
78 = 10x - 2
10x = 78 + 2
10x = 80
x = 80/10
x = 8, jadi panjang dan lebarnya :
panjang = 3x - 2
= 3.8 - 2
= 24 - 2
= 22
lebar = 2x + 1
= 2.8 + 1
= 16 + 1
= 17,
jadi panjangnya adalah 22cm
dan lebarnya adalah 17 cm
78 = 2(3x-2) + 2(2x+1)
78 = 6x-4 + 4x + 2
78 = 10x - 2
10x = 78 + 2
10x = 80
x = 80/10
x = 8
jadi
p = 3x - 2
= 3.8 - 2
= 24 - 2
= 22
l = 2x + 1
= 2.8 + 1
= 16 + 1
= 17