2. 3/4+3/4=6/4
6÷2=3kg
3.
a+b=306
a-b=b÷4
a|_____|_____|______|______|
b|_____|_____|suma 306
306÷6=51
51×2=102 nr b
51×4=204 nr a
Verificare 204+102=306
Testul 28
2.
a+b+c=?
a÷b=3r2
b÷c=3r2
a-b=328
a|____|______|______|+2
b|____|______|______|+2
c|_____|
328-2=326
326÷2=163 nr b
163×3+2=488+2=450
a=450
suma=450×2+163
900+163=1063
3.
5a=8c+4
2c=1a+2
8c+2c=2×5×8
8c+2c=80
10c=80
c=10 lei
5a=10×8
5a=80
a=13
