Tính nhanh:
a) (-4).(+125).(-25).(-6).(-8)b) (-98).(1 - 246) – 246.98
Giải:
a) \((-4).(+125).(-25).(-6).(-8)=[(4).(-25)].[125.(-8)].(-6)=100.(-1000).(-6)=600000;\)
b) \((-98).(1-246)-246.98=-98.1+98.246-246.98=98.[(-1)+246-246]=-98.\)
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