我想問一些正負數點計?

我想問一些正負數點計? (最好有步驟)
1. (-5+2)-(-13)
=(-3)+13
=+10


2.〔-6-(-16)〕+(-15)
=(-6+16)-15
=+10-15
=-5


3. (-17)+〔6+(-9)〕
=-17+(6-9)
=-17+(-3)
=-17-3
=-20


4. 15-(-3)-14+(-24)
=15+3-14-24
=18-14-24
=+4-24
=-20


5. 31+(-1)+(-18)-(-28)
=31-1-18+28
=30-18+28
=+12+28
=+40


6. -54+(-46)+(-100)-(-150)+(-1)-(-2)+(-11)
=-54-46-100+150-1+2-11
=-100-100+150-1+2-11
=-200+150-1+2-11
=-50-1+2-11
=-51+2-11
=-49-11
=-60


7. 39+〔-12+(-26)〕-(-99)
=39+(-12-26)+99
=39+(-38)+99
=39-38+99
=+1+99
=+100


8. -〔-(-21)+(-27)〕-〔-66-(-70)〕
=-(+21-27)-(-66+70)
=-(-6)-(+4)
=+6-4
=+2


9.〔-2+(-3)+(-5)〕+〔10-(-13)-(-7)〕+(-1)
=(-2-3-5)+(10+13+7)-1
=(-10)+(+20)-1
=-10+20-1
=+10-1
=+9


10.〔-23-(-18)〕-〔36+(-41)〕
=(-23+18)-(36-41)
=(-5)-(-5)
=-5+5
=0

(1)-5+2+13=10
(2)-6+16-15=-5
(3)-17+6-9=-20
(4)15+3-14-24=-20
(5)31-1-18+28=50
(6)-54-46-100+150-1+2-11=-60
(7)39-12-26+99=100
(8)-(21-27)-(66+70)=-21+27-66+70=10
(9)-2-3-5+10+13+7-1=19
(10)-23+18-36-41=-72