试卷导航
练习( P29)
1.(1)(-3)+(-5)=-(3+5)=-8.
(2)(-3)+5=+(5-3)= 2.
(3)3+(-5)=-(5-3)=-2.
(4)(-5)+5=0.
(5)(-5)+15=+(15-5)= 10.
(6)(-5)+25=+(25-5)= 20.
(7)6+(-5)=+(6-5)=1.(8)6+(-6)= 0.(9)6+(-7)=-(7-6)=-1.2.(1)(-18)+(-32)=-(18+32)=-50.(2)(-15.3)+(+14.9)=-(15.3-14.9)=-0.4.的)-信引--世--
3(1)(-30)+18=-(30-18)=-12.
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