1. 127.87 : 2 =63.935
63.935 - 0,9=62,035
Cele 2 numere sunt :63.935 si 62,035
2. a+b=48,38
a-b=14,26
a=48,38+b
14,26+b+b=48,38
14,26+2b=48,38
2b=48,38-14,26
2b=34,12
b=34,12 : 2
b=17,06
a=14,26+17,06
a=31,32
3. a+3,6=b
bx4=c
c-13,85=18,15
c=18,15+13,85
c=32
bx4=c
bx4=32
b=32:4
b=7
a+3,6=7
a+3,6=7
a=7-3,6
a=3,4
4. a-12,7=b
bx4=c
c+2,356=3,556
c=3,556-2,356
c=1,2
bx4=1,2
b=1,2:4
b=0,3
a-12,7=b
a-12,7=0,3
a=12,7+0,3
a=13
5. 10+5=15 (bidoane)
17x5=85
10x10=100
100+85=185
