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Calculeaza si efectueaza proba prin inmultire si impartire. 81:9=, 9×6=, 90:9=, 72:8=, 45:5=, 9×6=.repede te rog frumos.

Răspuns :

81:9=9 rest 0
Proba: 9•9=81 sau ... 81:9=9

9•6=54
Proba: 54:6=9 sau ... 6•9=54

90:9=10 rest 0
Proba: 90:10=9 sau ... 9•10=90

72:8=9 rest 0
Proba: 72:9=8 sau ... 8•9=72

45:5=9 rest 0
Proba: 45:9=5 sau ... 9•5=45

9•6=54
Proba: 54:6=9 sau ... 6•9=54
81:9=9 PROBA: 81:9=9 9×9=81
9×6=54 PROBA: 54:6=9 6×9=54
90:9=10 PROBA: 90:10=9 10×9=90
72:8=9 PROBA: 72:9=8 9×8=72
45:5=9 PROBA: 45:9=5 9×5=45
9×6=54 PROBA: 54:6=9 6×9=54