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b - 7 cm .
ob=2*6cm+2*7cm=26cm
a - 2 ½ cm .
b - 3 ½ cm .
Ob=2*2,5cm+2*3,5cm=12cm
a - 75 m .
b - 50 m .
Ob=2*75m+2*50m=250m
a - 27 m .
b - ?
Ob=2*27m+2*?m-100m=54m-2?m-100m
a - ?
b - 55 mm .
Ob=2*?m+2*55mm-210mm=2?m+110mm-210mm
Liczę na najlepszą ;)
2*6+2*7=26
2*2½+2*3½=5+7=12
2*75+2*50=250
27*2=54 100-54=46 46/2=23
55mm=5,5cm 5,5*2=11 21-11=10 10/2=5
mam nadzieje ze pomogłam...:D
2. 2 ½ x2 + 3 ½ x 2= 5 + 7 = 12 cm
3. 75 x2 + 50 x2 = 150 + 100 = 250 m
4. 27 x2 + ( 100 -27 ) x2 = 54 + 146 =200 m
5. 55 x2 + ( 210 - 55 ) x2 = 110 + 310 = 420 mm