问题标题:
求人帮我算算这六道数学题,要用递等式计算.(-31/4)+(-23/4)(-1.2)+(+11/5)1/3+(-7/3)(32/7)+(-25/7)(-1.9)+3.6+(-10.1)+1.4(-7)+(+11)+(-13)+9
问题描述:
求人帮我算算这六道数学题,要用递等式计算.
(-31/4)+(-23/4)(-1.2)+(+11/5)1/3+(-7/3)(32/7)+(-25/7)(-1.9)+3.6+(-10.1)+1.4(-7)+(+11)+(-13)+9
罗庆生回答:
(-31/4)+(-23/4)
=-(31/4+23/4)
=-6
(-1.2)+(+11/5)
-(6/5)+6/5
=0
1/3+(-7/3)
=1/3-7/3
=2
(32/7)+(-25/7)
=23/7-19/7
4/7
(-1.9)+3.6+(-10.1)+1.4
(3.6+1.4)+[(-1.9)+(-10.1)]
=-7
(-7)+(+11)+(-13)+9
=(11+9)-(13+7)
=0
怎样,初一的,对么
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