Bài 1:
a, ( -2 ) . ( -10 ) . ( -9 )
= 2 . 10 . ( -9 )
= 20 . ( -9 )
= -180
b, ( 5 + 25 ) . ( -7 )
= 30 . ( -7 )
= - ( 30 . 7 )
= -210
c, ( 8 - 5 ) . ( - 7 + 6 )
= 3 . ( -1 )
= -3
d, ( -9 - 21 ) . ( - 6 - 4 )
= ( -30 ) . ( -10 )
= 30 . 10
= 300
Bài 2:
a, `(-3)^3` . `(-5)^2`
= ( -27 ) . 25
= -675
b, `(-2)^3` . `4^4` . `(-5)^2`
= ( -8 ) . 256 . 25
= ( 8 . 25 ) . ( -256 )
= 200 . ( -256 )
= -51200
Bài 3:
( Mình không rõ đề ạ! )