Toán Lớp 6: a) 17 . [ 29 – ( -111 ) ] + 29 . ( -17 )
b) 19 . 43 + ( -20 ) . 43 – ( -40 )
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Toán Lớp 6: a) 17 . [ 29 – ( -111 ) ] + 29 . ( -17 )
b) 19 . 43 + ( -20 ) . 43 – ( -40 )
Comments ( 2 )
=17.{[29-(-111)]+29.(-1)}
=17.{140+(-29)}
=17.111
=1887
b)19 . 43 + ( -20 ) . 43 – ( -40 )
=43.(19-20)-(-40)
=43.(-1)+40
=(-43)+40
=-3