Explicație pas cu pas:
a)10+20+30+40=
r:(10+40)+(30+20)=50+50=100
b)22+23+7+8=
r:(22+8)+(23+7)=30+30=60
c)13+14+15+16+17=
r:(13+17)+(14+16)+15=30+30+15=60+15=75
d)5+15+68+12=
r:(5+15)+(68+12)=20+80=100
e)6+7+8+13+14+12=
r:(6+14)+(7+13)+(8+12)=20+20+20=40+20=60
f)25+15+5+15=
r:(25+5)+(15+15)=30+30=60
g)33+12+28+7=
r:(33+7)+(12+28)=40+40=80
h)22+25+18+15=
r:(22+18)+(25+15)=40+40=80
i)6+80+14=
r:(6+14)+80=20+80=100
j)1+2+3+27+28+29=
r:(1+29)+(2+28)+(3+27)=30+30+30=60+30=90
k)4+7+16+5+35=
r:(4+16)+(5+35)+7=20+40+7=60+7=67
l)18+19+15+1+5+2=
r:(18+2)+(19+1)+(15+5)=20+20+20=40+20=60
m)12+16+18+14=
r:(12+18)+(16+14)=30+30=60
n)25+37+25+13=
r:(25+25)+(37+13)=50+50=100
