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50mm=5cm
190cm-50mm=185cm
185cm=18,5cm
b)1,9dm
1,85dm
19dm=190cm
x+x+x+5+x+5=190
4x+10=190/-10
4x=180/4
x=45-1 bok
45+5= 50- 2 bok
spr.
2*45+2*50=190
b)45:10=4,5
50:10=5