Tính :
a) 3 × 9 + 18 = ..... = .....
5 × 5 + 27 = ..... = .....
b) 5 × 6 − 6 = ..... = ......
4 × 8 − 19 = ...... = ......
a) 3 × 9 + 18 = 27 + 18 = 45
5 × 5 + 27 = 25 + 27 = 52
b) 5 × 6 − 6 = 30 − 6 = 24
4 × 8 − 19 = 32 − 19 = 13
-- Mod Toán 2
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