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Calculeaza numarul necunoscut 6x6:a=4
20:2xa=90
4x2xa=80 pls ajutor


Răspuns :

6×6:9=36:9=4 a=9
20:2×9=10×9=90 a=9
4×2×10=8×10=80 a=10
A)6x6:a=4
a=6x6:4
a=36:4
a=9
B)20:2xa=90
a=90:(20:2)
a=90:10
a=9
C)4x2xa=80
a=80:4x2
a=80:8
a=10