自主练习,(,选自教材,P4-P7),+12,-1,+9,+2,0,-12,+4,、,+2.8,、,7,、,+16,、,-8,、,-20,、,-15.7,、,-4,东,5,西,7,-1,-8,-3,-2.5,-1.5,-0.5,1.5,2,3,-360,-280,-300,+1200,-400,-430,表示标准含量为,1500,毫升,误差范围是,25,毫升,真实含量在,1475,毫升与,1525,毫升之间。,表示标准含量为500克,误差范围是10克,真实含量在490克与510克之间。,-12,+5,+10,+4,-3,欣欣商店去年上半年,1,、,2,、,5,、,6,月份盈利，,3,、,4,月份亏损。,+10,+10,0,-10,+10,-10,+10,0,+10,+10,+10,+10,+10,+50,+10,+10,0,+10,-10,+10,+30,