Question

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8. Alla factorul necunoscut, folosind proba prin impartire ori inmultire.
a) b.7 - 42
b) r.5 - 35
c) d: 8-3
d) e: 96​

Answer 1

Bx7=42
B=42:7
B=6
Proba : 6x7=42 42:7=6


Rx5=35
R=35:5
R=7
Proba : 7x5=35 35:5=7

D:8=3
D=3x8
D=24
Proba : 24:8=3 8x3=24

E: 9=6
E=6x9
E=54
Proba : 54:9=6. 6 x9=54

Succes!