Question

帮我解答几题，有理数的加减法

用算式表示下面的结果.
1.温度由-4℃上升7℃.
2.收入7元,又支出5元.

计算
(1) 15+(-22) (2) (-13)+(-18)
(3) (-0.9)+1.5 (4) ½+(-2/3) 注: 2/3是三分之二
(5) (-10)+(+6) (6) (-5)+(-7) 1/3是三分之一
(7) (-0.9)+(-2.7) (8) (-1/3)+2/5 2/5是五分之二

各位谢了

Answer 1

1.温度由-4℃上升7℃.
(-4)+7=7-4=3

2.收入7元,又支出5元.
7+()-5
=7-5
=2

(1) 15+(-22)
=-(22-15)
=17

(2)(-13)+(-18)
=-(13+18)
=-31

(3)(-0.9)+1.5
=1.5-0.9
=0.6

(4)½+(-2/3)
=-(2/3-12)
=-1/6

(5)(-10)+(+6)
=-(10-6)
=-4

(6)(-5)+(-7)
=-(5+7)
=-12

(7)(-0.9)+(-2.7)
=-(0.9+2.7)
=-3.6

(8)(-1/3)+2/5
=2/5-1/3
=1/15

Answer 2

1.-4+7=3（℃）
2.+7+（-5）=2 净收入2元

计算
1.-7
2.-31 3.0.6
4.-1/6
5.-4
6.-12
7.-3.6
8.1/15

Answer 3

1.-4+7=3（℃）
2.+7+（-5）=2 净收入2元

计算
1.-7
2.-31 3.0.6
4.-1/6
5.-4
6.-12
7.-3.6
8.1/15

Answer 4

用算式表示下面的结果.
1.温度由-4℃上升7℃.-4+7=3
2.收入7元,又支出5元.+7+(-5)=2

计算
(1) 15+(-22)=-7 (2) (-13)+(-18)=-31
(3) (-0.9)+1.5 =0.6 (4) ½+(-2/3) =-1/6 注: 2/3是三分之二
(5) (-10)+(+6) =-4 (6) (-5)+(-7) =-12 1/3是三分之一
(7) (-0.9)+(-2.7) =-3.6 (8) (-1/3)+2/5 = -1/15 2/5是五分之二

Answer 5

1。-4+7=3℃.
2.7-5=2元
计算：
(1）15+(-22)=-(22-15)=-7
(2) (-13)+(-18)=-(13+18)=-31
(3) (-0.9)+1.5=+(1.5-0.9)=0.6
(4)1\2+(-2/3)=-(2/3-1/3)=-1/6
(5)(-10)+(+6)=-(10-6)=-4
(6)(-5)+(-7)= -(5+7)=-12
(7)(-0.9)+(-2.7)=-(0.9+2.7)=-3.6
(8)(-1/3)+2/5=+(2/5-1/3)=1/15