华东师大版七年级上册同步训练2.8.1 加减法统一成加法

适用年级:初一
试卷号:64821

试卷类型:课时练习
试卷考试时间:2019/6/13

1.单选题(共5题)

1.
“三个数-7,12,-2的代数和”与“它们的绝对值的和”的差为(  )
A.-18B.-6C.6D.18
2.
式子-4-2-1+2的正确读法是(  )
A.减4减2减1加2B.负4减2减1加2
C.-4,-2,-1加2D.4,2,1,2的和
3.
将算式-3-(-5)+(-2)写成省略加号的和的形式,正确的是(  )
A.-3+5-2B.-3+5+2C.-3-5-2D.3+5-2
4.
把算式-2-3-(+14)写成加法的形式是(  )
A.(-2)+(-3)+(-14)B.(-2)+(-3)-(-14)
C.(-2)+(+3)+(-14)D.(-2)+(+3)+(+14)
5.
设a为最小的正整数,b为最大的负整数,c是绝对值最小的有理数,则a-b+c的值为(  )
A.2B.-2C.2或-2D.以上都不对

2.选择题(共2题)

6.

根据短文理解,判断正误。

Be an Original

      It's said that we human beings are the only creatures who refuse to be what we are. One writer said, “When people are free to do what they want, they usually copy each other.” Yet nobody can be you as well as you can. Every successful person becomes successful because he or she discovered and developed his or her own special abilities. As a guy said, “One of the hardest things about climbing the ladder of success is getting through the crowd of copies at the bottom.”

      So remember you are a specialist. You're not made to be all things to all people. Surveys have shown that usually about 20 percent of all the people who know you don't really like you that much. You just can't please all the people all the time! So don't try to have peace at all costs, especially at the cost of your own success. “Don't stay where you're tolerated (忍受), go where you're celebrated!” Be yourself. Be an original (有独创性的人)! You really are one-of-a-kind. You're the first and last person who will ever be exactly like you.

      Do you know that over 90 percent of all flowers have no smell at all? It's the ones with a sweet fragrance (香味) and smell that we remember. So don't be afraid to be different, if it means being yourself. We are like rivers, “If we follow the easy path of least resistance, it will make us crooked (弯曲).” So don't follow where the path may lead, go where there is no path and leave your own trail. “You're born an original, don't die a copy!” Too many people are like the living dead, they've buried their real talents and abilities.

7.下列产品所用的塑料,具有热固性的是(   )

3.填空题(共4题)

8.
把下列算式写成省略加号的和的形式:
(1)(+1)-(-4)+(-3)+(+2)-(-7)=____________________________________;
(2)=____________________________________.
9.
把(-12)-(-13)+(-14)-(+15)+(+16)统一成加法的形式是_______________,写成省略加号的和的形式是________________,读作______________________________或______________________________.
10.
算式-7+4-6-10读作____________________________________,也可读作________________________.
11.
若规定图形表示运算a-b+c,图形表示运算x+z-y-w,则=________.

4.解答题(共3题)

12.
把下列式子写成省略加号的和的形式,并写出它们的两种读法.
(1)(-6)-(-3)+(-2)-(+4)-(-7);
(2).
13.
按运算顺序直接计算:
(1)(-49)-(+91)-(-5)+(-9);
(2).
14.
已知a=-3,b=-2,c=-5,求a-b-c的值.
试卷分析
  • 【1】题量占比

    单选题:(5道)

    选择题:(2道)

    填空题:(4道)

    解答题:(3道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:9

    7星难题:0

    8星难题:0

    9星难题:3