1. Ư(9) = { -1; -3 ;-9;1;3;9 }
2. 0 12 24 36 48
3 a (28-28) + (-15 + 45) = 0 +30 = 30
b 17 +65 +43 - 43 -65 = 17 + (65-65) + (43-43) =17
c { (-25). (-4) } ( 7.3 ) = 100. 21 =2100
1. 1,,3,9,-1,-3,-9
2, 12,24,36,48,60
3, a, 30
b, 17
c, 2100
B1: Ư(-9) = { 1; -1; 3; -3; 9; -9 }
B2: B(12) = { 0; 12; -12; 24; -24 }
B3:
a. 28 -15 + 45 - 28
= ( 28 - 28 ) + ( 45 - 15 )
= 10 + 30 = 30
b. 17 - (-65) + 43 - ( 43 + 65 )
= 17 - (-65) + 43 - 43 - 65
= 17 - ( - 65 + 65 ) - ( 43 - 43 )
= 17 - 0 - 0 = 17
c. (-25) . 7 . (-4) . 3
= ( -25 . -4 ) . ( 7 . 3 )
= 100 . 21 = 2100