a) 27.75 + 25.27 - 150 b) 2 . [ ( 7 - 3^3 : 3^2 ) : 2^2 + 90 ] - 100
= 27. ( 75 + 25 ) - 150 = 2 . [ ( 7 - 27 : 9 ) : 4 + 90 ] - 100
= 27. 100 - 150 = 2 . [ ( 7 - 3 ) : 4 + 90 ] - 100
= 2700 - 150 = 2 . [ 4 : 4 + 90 ] - 100
= 2550 = 2. [ 1 + 90 ] - 100
= 2. 91 - 100
= 182 - 100
= 82
c) 27 : 2^2 + 5^4 : 5^3 . 24 - 3 . 2^5 d) 5 . [ ( 85 - 35 - 7 ) : 8 + 90 ] -150
= 27 : 4 + 5 . 24 - 3 . 32 = 5 . [ ( 50 - 7 ) : 8 + 90 ] - 150
= 6,75 + 120 - 96 = 5 . [ 43 : 8 + 90 ] - 150
= 126,75 - 96 = 5 . [5,375 + 90 ] - 150
= 30,75 = 5 . 95,375 - 150
= 476,875 - 150
= 326,875
e) 150 + 50 : 5 - 2 . 32 g) ( 7^2005 + 7^200 ) : 7^2004
= 150 + 10 - 64 = 7^2205 : 7^2004
= 160 - 64 = 7^201
= 96
học tốt nha !
