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K = 2(p+l)
66 = 2(x+3 + x)
66 = 2(2x + 3)
66 = 4x + 6
60 = 4x
x = 15
jd panjang = 18 dan lebar = 15
no 2)
mie = 30 x 144 x 900 = 3.888.000
minyak = 50 x 5400 = 270.000
totalnya = 4.158.000
no 3)
anggap tab anita itu x
2x + 30.000 = 100.000
2x = 70.000
x = 35.000
no 4)
x + x+1 = 33
2x + 1 = 33
no 5)
keliling dalam x
k = 2(p+l)
= 2( 3x - 4 + x + 1)
= 2(4x - 3)
= 8x - 6
keliling jika x = 12
k = 8x - 6
= 8(12) - 6
= 96 - 6
= 90