Răspuns :
( 10 x 50) + 100 = 500 + 100 = 600
10 + 50 + 100 = 160
100+100-10 =190
100 + 100 - 50 = 150
100 + 50 - 20 = 130
100-100+ 100=100
10 + 50 + 100 = 160
100+100-10 =190
100 + 100 - 50 = 150
100 + 50 - 20 = 130
100-100+ 100=100
.(10·50)+100=600
.10+50+100=160
.100+100-10=190
.100+100-(5·10)=150
.100+50-(2·10)=130
.100-100+(10·10)=100