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a) (6+3)×9= l
II
b) (9+5)×10= l
II
c) 8×(13-7)= I
II
d) (16-7)×4= I
II


Răspuns :

(6+3)×9=9×9=81
(6+3)×9=6×9+3×9=54+27=81

(9+5)×10=14×10=140
(9+5)×10=9×10+5×10=90+50=140

8×(13-7)=8×6=48
8×(13-7)=8×13-8×7=104-56=48

(16-7)×4= 9×4=36
(16-7)×4= 16×4-7×4=64-28=36