Tính
a) (+5).(+11)
b) (-6).9
c) 23.(-7)
d) (-250).(-8)
e) (+4).(-3)
a) (+5).(+11) = 55
b) (-6).9 = -54
c) 23.(-7) = -161
d) (-250).(-8) = 2000
e) (+4).(-3)= -12
-- Mod Toán 6
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