Tính:
a) (26 – 6).(-4) + 31.(-7 -13)
b) (-18).(55 – 24 ) – 28.(44 – 68)
a) (26 – 6).(-4) + 31.(-7 -13) = 20.(-4) + 31.(-20) = -80 + (-620) = -700
b) (-18).(55 – 24 ) – 28.(44 – 68) = (-18).31 – 28.(-24) = -558 + 672 = 114
-- Mod Toán 6
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