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1. 4x?x?=16 2. 4x?x?=4 3. ?x?x4=40

Răspuns :

1) 4x4x1=16x1=16
2) 4x1x1=4x1=4
3) 2x5x4=10x4=40
4x4x1=16

4x1x1=4

5x2x4=40