maths!!!!!!

1.(+6)/(-2)+(+5)
=(-3)+5
=5-3
=2


2.(+84)-(+32)x(-2)
=(84-32)x(-2)
=52x(-2)
=(-104)


3.(-1)+(5)(-2)-(-7)
=5(-2)-1+7
=(-10)-1+7
=7-10-1
=(-3)-1
=(-4)


4.(-10)+(+50)-(+49)/(-7)
=(-10)+50-[49/(-7)]
=40-(-7)
=47


5.(-4)(-2)+(-5)(-3)
=8+15
=23


6.(+8)(-2)-(-7)(+4)
=(-16)-(-28)
=(-16)+28
=12


7.(-15)/(-3)+(+49)/(-7)
=5+[49/(-7)]
=5+(-7)
=5-7
=(-2)


8.(-28)/(+4)-(-3)(-6)
=(-7)-18
=(-25)

1.-3+(+5)
=-3+5
=2
2.(+48)-(-16)
=+48+16
=64
3.(-1)+(-10)-(-7)
=-1-10+7
=-11+7
=-4
4.(-10)+(+50)-(-5又4/7)
=-10+50+5又4/7
=40+5又4/7
=45又4/7
5.(-8)+(-15)
=-8-15
=-23
6.(-16)-(-28)
=-16+28
=-44
7.(-5)+(-5又4/7)
=-5-5又4/7
=4/7
8.(-7)-(-18)
=-7+18
=11

1. (+6)/(-2)+(+5) = -3+(+5) =2

2. (+84)-(+32)x(-2) =(+84)-(-64) =148

3. (-1)+(5)(-2)-(-7) =(-1)+(-10)-(-7) =(-11)-(-7) = -4

4. (-10)+(+50)-(+49)/(-7) =(-10)+(+50)-(-7) =(+40)-(-7) =47

5. (-4)(-2)+(-5)(-3) =8+15 =23

6. (+8)(-2)-(-7)(+4) =(-16)-(-28) =12

7. (-15)/(-3)+(+49)/(-7) =5+(-7) =-2

8. (-28)/(+4)-(-3)(-6) =(-7)-18 =-25

2007-09-26 18:25:39 補充：
第二題 :先乘除後加減