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1- 1/5 eller denna 3 2/7+ 4 4/7
Uppgift 1
1-1/5=1×5/5-1/5=5/5-1/5=(5-1)/5=4/5=2×4/(2×5)=8/10=0,8
Uppgift 2
3+2/7+4+4/7=3×7/7+2/7+4×7/7+4/7=21/7+2/7+28/7+4/7=(21+2+28+4)/7=55/7=(49+6)/7=49/7+6/7=7+6/7≈7,86
1/5=0.2
1-0.2=0.8