負數既加減乘除 form1 20點架[=

1.[(+3)-(-2)x(-1)-(8)x(-0.5)](+5)= 1.2

2.(-100)[(-3)-(-7)x(+4)]= - 4

3.[(+16)+(-28)]+(-5)x(+2)= - 22

4.[(-4)+(+17.6)(-0.8)](-2.5)= 10.4

5.[-2/3 - (- 3/4)]1/12= 1

6.(+5)x(-6)/(-3)+(+13)= 23

7. 2.75[(-3)-(-2)]x(1/5)= - 0.55

8.(+16)+(-2)(-2)x(-3)= 13

9. (-20)-(+18)(-2/3)x(-4)+(-5)= -73

10.(+1/2)+(-1/3)x(+1 1/3)= 1 / 18

希望冇錯啦 ~
圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_22.gif

1 -0.6
2 -4
3 -22
4 4.8
5 8.333333...
6 23
7 -13.75
8 13
9 -133
10 -13/18