七年级数学上册第一章有理数1.3有理数的加减法1.3.1有理数的加法第1课时有理数的加法课件(新版)新人教版.ppt

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知识点 有理数的加法运算 例 计算:,【思路点拨】 解题关键是判断每个加数的符号,然后确定法则,应用法则计算结果.,解:(1)(-4)+(-6)=-(4+6)=-10. (2)(+15)+(-17)=-(17-15)=-2.,1.(2016温州)计算(+5)+(-2)的结果是( ) (A)7 (B)-7 (C)3 (D)-3 2.在1,-1,-2这三个数中,任意两数之和的最大值是( ) (A)1 (B)0 (C)-1 (D)3 3.一个数是11,另一个数比11的相反数大2,那么这两个数的和为( ) (A)24 (B)-24 (C)2 (D)-2 4.如果两个数的和为正数,那么( ) (A)这两个加数都是正数 (B)一个数为正,另一个为0 (C)两个数一正一负,且正数绝对值大 (D)必属于上面三种之一,C,B,C,D,5.若有理数m,n在数轴上的位置如图,则m+n的值为( )(A)大于0 (B)小于0 (C)大于m (D)小于n 6.某足球队在一场比赛中上半场负5球,下半场胜4球,那么全场比赛该队净胜 球. 7.某天早晨的气温是-7 ,中午上升了11 ,则中午的气温是 . 8.绝对值小于5的所有整数的和为 .,A,-1,4,0,(2)10+(-2)+(-15)=8+(-15)=-7. 所以半夜的气温是-7 .,

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