Question

Tính nhanh :

a ) ( -4 ) . ( +125 ) . ( -25 ) . ( -6 )  . ( -8 )

b ) ( -98 ) . ( 1 - 246 ) - 246 . 98

Answer 1

a ) ( -4 ) . ( +125 ) . ( -25 ) . ( -6 )  . ( -8 )

=[(-4).(-25)].[125.(-8)].-6

=[100.(-1000)].(-6)

=-100000.(-6)

=60000

 

b ) ( -98 ) . ( 1 - 246 ) - 246 . 98