习题1.4第1题答案
(1)(-8)×(-7)=56
(2)12×(-5)=-60
(3)2.9×(-0.4)=-1.16
(4)-30.5×0.2=-6.1
(5)100×(-0.001)=-0.1
(6)-4.8×(-1.25)=6
习题1.4第2题答案
(1)1/4×(-8/9)=-2/9
(2)(-5/6)×(-3/10)=1/4
(3)-34/15×25=-170/3
(4)(-0.3)×(-10/7)=3/7
习题1.4第3题答案
(1)-1/15
(2)-9/5
(3)-4
(4)100/17
(5)4/17
(6)-5/27
习题1.4第4题答案
(1)-91÷13=-7
(2)-56÷(-14) =4
(3)16÷(-3)=-16/3
(4)(-48)÷(-16)=3
(5)4/5÷(-1)=-4/5
(6)-0.25÷3/8=-2/3
习题1.4第5题答案
-5,-1/5,-4,6,5,1/5,-6,4
习题1.4第6题答案
(1)(-21)/7=-3
(2)3/(-36)=-1/12
(3)(-54)/(-8)=27/4
(4)(-6)/(-0.3)=20