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7x2:2=10,5 dm²
(2+1)x1:2=1,5 dm²
10+10,5+1,5=22 dm²
b) (8+5)x2,5:2=13+2,5:2=32,5:2=16,25 dm²
(3+2,5)x1:2=5,5:2=2,75 dm²
1x0,5=0,5 dm²
16,25+2,75+0,5=19,5 dm²
dasz naj??