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浙教版七年级上册数学书第32页作业题答案

1第32页作业题第1题答案

(1)(-1)+ 0 + 3 

= (-1)+ 3

= 2

(2)(-10)+ 21 + (-13)

= [(-10)+(-13)] + 21

= (-23)+ 21

= -2

(3)3 +(-2.5)+(-4)

= 3 + [(-2.5)+(-4)]

= 3 +(-6.5)

= -3.5

2第32页作业题第2题答案

(1)2.15 +(-4.25)+(-0.75)+(-230)

= 2.15 +(-4.25)+(-0.75)+(-0.15)

= [2.15 +(-0.15)] + [(-4.25)+(-0.75)]

= 2 +(-5)

= -3

(2)(-3/4)+(-1/6)+(+1/4)+(-5/6)

= [(-3/4)+(+1/4)] + [(-1/6)+(-5/6)]

=(-1/2)+(-1)

= -1又1/2.

理由略

3第32页作业题第3题答案

解:(+120)+(-27.6)+(-5)+(-74)+(+16.8)+(-31.9)+(+25)

=(120 + 16.8 + 25)+[(-27.6)+(-5)+(-74)+(-31.9)]

= 161.8 +(-138.5) 

= 23.3(元)

答:婷婷家这星期结余23.3元

4第32页作业题第4题答案

解:(-2)+(+2)+(-3.5)+(-0.5)+(+3)+(+4)= 3(千克)

50 × 6 + 3 = 303(千克)

答:这6筐蔬菜的总质量为303千克

5第32页作业题第5题答案

(1)(-3)+(-6)+(-2)=11

(2)(-2)+(+5)+(-3)=0

(注:答此题案不唯一)

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