1
2=1÷2⋅100=0.5⋅100=50%
1
4=1÷4⋅100=0.25⋅100=25%
1
5=1÷5⋅100=0.2⋅100=20%
1
10=1÷10⋅100=0.1⋅100=10%
1
20=1÷20⋅100=0.05⋅100=5%
1
25=1÷25⋅100=0.04⋅100=4%
1
50=1÷50⋅100=0.02⋅100=2%
б)2
4=2÷4⋅100 =0.5⋅100=50%
2
5=2÷5⋅100 =0.4⋅100=40%
7
10=7÷10⋅100=0.7⋅100=70%
9
20=9÷20⋅100=0.45⋅100=45%