Question

Giúp mình với !!!

a) 25 . ( -75 + 32 ) - 75 . ( 94 - 51 )

b) ( -4 )² . ( | x + 4 | . -9 ) = ( -8 ) + ( -12 ) . ( -10 )

Answer 1

a) ( - 78 ) . ( 1 + 187 ) + 187 . 78

= ( - 78 ) + ( - 78 ) . 187 + 187 . 78

= ( - 78 ) + 187 . [ ( - 78 ) + 78 ]

= ( - 78 ) + 187 . 0

= ( - 78 ) + 0

= ( - 78 )

b) ( - 39 ) . 15 - 36 . 39 - 49 . ( - 39 )

= ( - 39 ) . 15 + 36 . ( - 39 ) - 49 . ( - 39 )

= ( - 39 ) . ( 15 + 36 - 49 )

= ( - 39 ) . 2

= - 78

Answer 2

a) (-78).(1+187) + 187.78 = -78 - 78.187 +187.78 = -78

b) (-39).15 - 36.39 - 49.(-39)

= -39.15 - 36.39 + 49.39

=39.(-15-36+49)

= 39.(-2)

= - 78

Tích mk nha !!!!~~

Answer 3

a) ( -78 ) . ( 1+187 ) + 187 . 78

= 78 . -(1+187) +187 . 78

=78 . -188 + 187 . 78

= 78 . ( -188 + 187 )

=78 . -1 = -78

b) ( -39 ) .15 -36 . 39 -49.(-39)

=(-39).15+36.(-39) - 49 .(-39)

=-39. ( 15+36-49)

=-39 . 2

=-78

học tốt ~~~

Answer 4

CẢM ƠN CẢ 3 CẬU !! ^_^