有理数的加法 (7)审核通过

April 17, 2021, 7:33 a.m. 文档页面

【文章导读】1,(), ,2, :, “+1” “-1” . :, . ,(+1)+(-1)=0,3, ,(-1)+(+1)=0, :,4,(1) :, 2 3 . ,(-2)+(-3),5,,,(-2)+(-3),,= -5, :,6,,,,

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【正文内容】

1,(),,2,:,“+1”“1”.:,.,(+1)+(1)=0,3,,(1)+(+1)=0,:,4,(1):,23.,(2)+(3),5,(2)+(3),=5,:,6,(2)(3)+2,=1,:,7,(3)3+(2),=1,:,8,(4)(4)+4,=0,:,9,:,(1)(2)+(3)=,0,1,2,1,2,3,4,5,5,10,:,(2)(3)+2=,0,1,2,1,2,3,4,5,1,11,(3)3+(2)=,0,1,2,1,2,3,3,1,:,12,:,(4)(4)+4=,0,1,2,1,2,3,4,5,0,13,(1)(2)+(3)=5,(2)(3)+2=1,(3)(+3)+(2)=1。

(4)(4)+4=0,0,.,14,.,.,0.0.,,15,:,(1)180+(10),(2)(10)+(1),(3)5+(5),(4)0+(2),,16,,(+5)+(2)=7()(5)+(2)=3()(5)+(+2)=7()(+5)+(2)=3().(),

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