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Calculează.
a. 123 x 3
243 × 2
132 x 3
234 x 2

b. 574 x 5
694 × 6
787 × 9
548 x 7

c. 3 249 x 6
4 875 × 8
2 694 × 6
7 876 × 9

d.42 174 x 6
34 828 x 9
13 709 x 8
28 764 x 7