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120 =3x+4x+5x
120=12x
x=10cm
3x10=30cm
4x10=40cm
5x10=50cm
b. luas axtx1/2
30x40x1/2
60cm persegi
= 12x
120
_____ = 10
12
x= 10
sisi ab = 30cm
bc = 40cm
ca = 50 cm
luas = 30 x 40
_________ = 600 cm
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