北大绿卡数学七年级上答案18页5题19页11题 急五大题(1)(+7)+(-6)+(-7)+(+6) (2)(-2.6)+(-3.4)+(+2.3)+(1.5)+(-2.3) (3)丨-13丨+丨-53丨+(-21)+0(4)(-3¼)+(+3⅔)+(+2¼)+(-1⅔) 十一大题用简
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![北大绿卡数学七年级上答案18页5题19页11题 急五大题(1)(+7)+(-6)+(-7)+(+6) (2)(-2.6)+(-3.4)+(+2.3)+(1.5)+(-2.3) (3)丨-13丨+丨-53丨+(-21)+0(4)(-3¼)+(+3⅔)+(+2¼)+(-1⅔) 十一大题用简](/uploads/image/z/10921858-34-8.jpg?t=%E5%8C%97%E5%A4%A7%E7%BB%BF%E5%8D%A1%E6%95%B0%E5%AD%A6%E4%B8%83%E5%B9%B4%E7%BA%A7%E4%B8%8A%E7%AD%94%E6%A1%8818%E9%A1%B55%E9%A2%9819%E9%A1%B511%E9%A2%98+%E6%80%A5%E4%BA%94%E5%A4%A7%E9%A2%98%281%29%28%2B7%29%2B%28-6%29%2B%28-7%29%2B%28%2B6%29+%282%29%28-2.6%29%2B%28-3.4%29%2B%28%2B2.3%29%2B%281.5%29%2B%28-2.3%29+%283%29%E4%B8%A8-13%E4%B8%A8%2B%E4%B8%A8-53%E4%B8%A8%2B%EF%BC%88-21%EF%BC%89%2B0%EF%BC%884%EF%BC%89%EF%BC%88-3%26%23188%3B%EF%BC%89%2B%EF%BC%88%2B3%26%238532%3B%EF%BC%89%2B%EF%BC%88%2B2%26%23188%3B%EF%BC%89%2B%EF%BC%88-1%26%238532%3B%EF%BC%89+%E5%8D%81%E4%B8%80%E5%A4%A7%E9%A2%98%E7%94%A8%E7%AE%80)
北大绿卡数学七年级上答案18页5题19页11题 急五大题(1)(+7)+(-6)+(-7)+(+6) (2)(-2.6)+(-3.4)+(+2.3)+(1.5)+(-2.3) (3)丨-13丨+丨-53丨+(-21)+0(4)(-3¼)+(+3⅔)+(+2¼)+(-1⅔) 十一大题用简
北大绿卡数学七年级上答案18页5题19页11题 急
五大题(1)(+7)+(-6)+(-7)+(+6) (2)(-2.6)+(-3.4)+(+2.3)+(1.5)+(-2.3) (3)丨-13丨+丨-53丨+(-21)+0
(4)(-3¼)+(+3⅔)+(+2¼)+(-1⅔) 十一大题用简便方法计算(1 )0.125+(+3¼)+(-3¼)+(+⅞)+(-0.25) (2)(+3/17)+(-3.36)+[(+7.36)+(+14/17)]
(3)(+1)+(-2)+(+3)+(-4)+......+(+99)+(-100)
北大绿卡数学七年级上答案18页5题19页11题 急五大题(1)(+7)+(-6)+(-7)+(+6) (2)(-2.6)+(-3.4)+(+2.3)+(1.5)+(-2.3) (3)丨-13丨+丨-53丨+(-21)+0(4)(-3¼)+(+3⅔)+(+2¼)+(-1⅔) 十一大题用简
五(1):=7-6-7+6=1-7+6=-6+6=0
(2)=-2.6-3.4+2.3+1.5-2.3=-6+2.3+1.5-2.3=-3.7+1.5-2.3=-2.2-2.3=-4.5
(3)=13+53-21=45
(4)=(-3+2)¼+(3-1)⅔=-1+2⅔=
十一(1)你题目应该是打错了
(2)=3/17-3.36+7.36+14/17=(3/17+14/17)+(7.36-3.36)=1+4=5
(3)
因为:1+(-2)=-1,3+(-4)=-1,且加法可以随意运用结合率,把相邻两个正负数相加.
所以:1+(-2)+3+(-4)+ …… +99+(-100)
=[1+(-2)]+[3+(-4)]+ …… [99+(-100)]
=-1+(-1)+(-1)+ …… +(-1) (50个-1)
=(-1)×50
=-50