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a)
6 x (4 + 2) = 6 x 4 + 6 x 2 = 24 + 12 = 36
(7 + 1) x 2 = 7 x 2 + 1 x 2 = 14 + 2 = 16
3 x (9 - 4) = 3 x 9 - 3 x 4 = 27 - 12 = 15
b)
9 x (5 - 3) = 9 x 5 - 9 x 3 = 45 - 27 = 18
(7 +2) x 4 = 7 x 4 + 2 x 4 = 28 + 8 = 36
(8 - 6) x 5 = 8 x 5 - 6 x 5 = 40 - 30 = 10
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