計負數要steps

1. (+8)-(-4)(+3)除(+2)(-2)
=(+8)-(-12)/(-4) {先乘除後加減..}
=(+8)-(+3)
=+8-3
=+5 {可唔寫+號}

2. [(-15)+(-3)(+5)]/[(-4)(-3)]
=[(-15)+(-15)]/[+12]
=[-15-15]/+12
=-30/+12
=-2.5 {這可一定要寫-號}

1. (+8)-(-4)(+3)除(+2)(-2)
=8+4x3 / (-2)
=8+7/(-2)
=15/2
=7.5

2.[(-15)+(-3)(+5)]除[(-4)(-3)]
=-15-15 /12<---因為負負得正
= -30/12
= 2.5


希望幫到你喇^___^

2008-09-20 18:26:14 補充：
sorry..第1題...
1. (+8)-(-4)(+3)除(+2)(-2)
=(+8)-(-12)/(-4)
=(+8)-(+3)
=5
咁先岩..

1. (+8)-(-4)(+3)除(+2)(-2)
= 8-(-12)除(-4)
=8-3
=5
2. [(-15)+(-3)(+5)]除[(-4)(-3)]
=[(-15)+(-15)除(+12)]
=-15+5分之4
=-14又5分之1

2008-09-20 17:52:18 補充：
SOR
2. [(-15)+(-3)(+5)]除[(-4)(-3)]
=[(-15)+(-15)]除(+12)
=-30除12
=-2分之5

1.(+8)-(-4)(+3)/(+2)(-2)
=(+8)-(-12)/(-4)
=(+8)-(+3)
=+5
2.[(-15)+(-3)(+5)]/[(-4)(-3)]
=[(-15)+(-15)]/(+12)
=(-30)/(+12)
=(-5)/(+2)