2018年秋七年级数学上册第一章有理数第11课时有理数的减法(2)(作业本)课件(新版)新人教版.ppt

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作 业 本,第11课时 有理数的减法(2),第一章 有理数,作 业 本,一、选择或填空题(每题10分,共40分) 1把(+5)(+3)(1)+(5)写成省略括号的和的形式是( ) A53+15 B5315 C5+3+15 D53+15 2下列计算不正确的是( ) A(6)+(4)=2 B(9)(4)=5 C|9|+4=13 D9+(4)=13,D,C,作 业 本,3计算:2.5+(2 )1.75+( )=_4某地上午气温为10 ,下午上升2 ,到半夜又下降15 ,那么半夜的气温为_,-2,-3,作 业 本,二、解答题(每题15分,共60分) 5计算:2+(8)(7)56计算:(40)(28)(19)+(24),解:-4,解:-17,作 业 本,7计算:7(3)+(5)|8|8计算:,解:-3,解:-8,

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