第28页

信息发布者:
D
B
-3 + 4 - 5 - 6
负3,正4,负5,负6的和
负3加4减5减6
解:原式​$=-\frac {5}{9}-\frac {3}{5}-\frac {4}{9}-\frac {2}{5}=-2$​
解:原式​$=-9+\frac {4}{5}+12-\frac {4}{5}= 3$​
解:原式​$=2 \frac {3}{4}+\frac {1}{4}-2 \frac {1}{4}-2 \frac {3}{4}= -2$​
解:原式​$=-3+9-6=0$​
解: (1)$(-3)*2 = (-3 + 2) - |2 - (-3)| = -1 - 5 = -6;$
(2)$4*3 = (4 + 3) - |3 - 4| = 7 - 1 = 6,$$6*(-5) = (6 + (-5)) - |-5 - 6| = 1 - 11 = -10$
D
A