1.计算:(+160)+(-90) (1 1/4)+1.25 (-0.5)+4.3
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1.计算:(+160)+(-90) (1 1/4)+1.25 (-0.5)+4.3
2.2,1,-5 有理数之和等于()
3.如果a=-3,b=-7,则a+b=(),|a|+|b|=( )
4.(-3)+()=-12 ()+(-5)=7 (+4)+()=0
5.如果|x|=2,|y|,=3 x,y同号是,x+y=()或() x,y异号时,x+y=()或()
6.直接写出结果:100+(-20) (-8)+8 (-20)+(-15) (-2)+0
(-65)+(+15) 0+(-5)
7.计算:(+3/5)+(-7/12) (-3 2/3)+(-1/6) (-0.25)+(+3/4)
(+1、579)+(-0.874) 1+(-1/2)+(-1/3) (-1/5)+0+(+8/15)
2.2,1,-5 有理数之和等于()
3.如果a=-3,b=-7,则a+b=(),|a|+|b|=( )
4.(-3)+()=-12 ()+(-5)=7 (+4)+()=0
5.如果|x|=2,|y|,=3 x,y同号是,x+y=()或() x,y异号时,x+y=()或()
6.直接写出结果:100+(-20) (-8)+8 (-20)+(-15) (-2)+0
(-65)+(+15) 0+(-5)
7.计算:(+3/5)+(-7/12) (-3 2/3)+(-1/6) (-0.25)+(+3/4)
(+1、579)+(-0.874) 1+(-1/2)+(-1/3) (-1/5)+0+(+8/15)
![1.计算:(+160)+(-90) (1 1/4)+1.25 (-0.5)+4.3](/uploads/image/z/7626432-48-2.jpg?t=1.%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%88%2B160%EF%BC%89%2B%EF%BC%88-90%EF%BC%89+%EF%BC%881+1%2F4%EF%BC%89%2B1.25+%EF%BC%88-0.5%EF%BC%89%2B4.3)
1(+160)+(-90)=160-90=70
(1 1/4)+1.25=1 1/4+1.25=2.75+1.25=4
(-0.5)+4.3=-0.5+4.3=3.8
2. 2,1,-5 有理数之和等于(-2)
过程: 2+1-5=-2
3.如果a=-3,b=-7,则a+b=(-10),|a|+|b|=( 10)
过程: -3-7=-10 |-3|+|-7|=3+7=10
4.(-3)+(-9)=-12 (12)+(-5)=7 (+4)+(-4)=0
5.如果|x|=2,|y|,=3 x,y同号是,x+y=(5)或(-5) x,y异号时,x+y=(1)或(-1)
6.直接写出结果: 100+(-20)=80 (-8)+8 =0 (-20)+(-15)=-35 (-2)+0=-2
(-65)+(+15)=-50 0+(-5)=-5
7.计算: (+3/5)+(-7/12)= 3/5 -7/12 =1/60
(-3 2/3)+(-1/6)此题怀疑抄写有误
(-0.25)+(+3/4)=-0.25+3/4=1
(+1、579)+(-0.874)=1、579-0.874=0.705
1+(-1/2)+(-1/3) =1-1/2-1/3=1/6
(-1/5)+0+(+8/15)=-1/5+8/15=-1/3
(1 1/4)+1.25=1 1/4+1.25=2.75+1.25=4
(-0.5)+4.3=-0.5+4.3=3.8
2. 2,1,-5 有理数之和等于(-2)
过程: 2+1-5=-2
3.如果a=-3,b=-7,则a+b=(-10),|a|+|b|=( 10)
过程: -3-7=-10 |-3|+|-7|=3+7=10
4.(-3)+(-9)=-12 (12)+(-5)=7 (+4)+(-4)=0
5.如果|x|=2,|y|,=3 x,y同号是,x+y=(5)或(-5) x,y异号时,x+y=(1)或(-1)
6.直接写出结果: 100+(-20)=80 (-8)+8 =0 (-20)+(-15)=-35 (-2)+0=-2
(-65)+(+15)=-50 0+(-5)=-5
7.计算: (+3/5)+(-7/12)= 3/5 -7/12 =1/60
(-3 2/3)+(-1/6)此题怀疑抄写有误
(-0.25)+(+3/4)=-0.25+3/4=1
(+1、579)+(-0.874)=1、579-0.874=0.705
1+(-1/2)+(-1/3) =1-1/2-1/3=1/6
(-1/5)+0+(+8/15)=-1/5+8/15=-1/3