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(6·8):2=48:2=24
24·4=96
96cm²+36cm²=132cm²
b) 6cm·8cm=48
61·6=96
2·96=192
8·12=96
2·96=192
192+192+48=432 =
PΔ = a·h = 3· = = 4,5
4·4,5 = 18
d) 10·13 = 130
130:2=65
= 30·2=60
65+60=125