1练习第34页第一题答案
解:(1)原式=[(-7)+(-11)+(-2)]+(+10)
=(-20)+(+10)=-10.
(2)原式=[2+(+4)+6]+[(-3)+(-5)]
=(+12)+(-8)=4.
(3)原式=[(-9.6)+(-0.4)+(-0.3)]+(1.5+8.5)
=(-10.3)+10=-0.3.
2练习第34页第二题答案
解:-3+(+5)+(-3)+(-4)
=(-10)+(+5)=5(℃)