MATH!急!!PLZ

1.(-52)/[(+2)X(-13)]
=(-52)/(-26)
=2


2.(-12)X[(-20)/(-4)]
=(-12)/5
=(-2.4)


3.(+100)/[(-2)X(+5)]
=100/(-10)
=(-10)


4.(-7.2)/[(-3.6)X(+5)]
=(-7.2)/(-18)
=0.25

1.(-52)/[(+2)X(-13)]
= (-52)/(-26)
= 2

2.(-12)X[(-20)/(-4)]
= (-12)X(5)
= -60

3.(+100)/[(-2)X(+5)]
=(+100)/(-10)
=-10

4.(-7.2)/[(-3.6)X(+5)]
=(-7.2)/(-18)
= 0.4

应该系甘~~~我在内地學咗用4年拉~~~

1) (-52)/[(+2)X(-13)]
=(-52)/(-26)
=+2

2) (-12)X[(-20)/(-4)]
=(-12)X(+5)
=-70

3) (+100)/[(-2)X(+5)]
=(+100)/(-10)
=-10

4) (-7.2)/[(-3.6)X(+5)]
=(-7.2)/(-18)
=+4

希望幫到你^^

2007-09-26 18:25:28 補充：
只要記得負負得正,正正得正,正負得負,同負正得正就得啦!!努力學好數學牙!!!

2007-09-26 18:28:13 補充：
sor第4題漏了點,其實係+0.4以上果二位係岩既!!so sor=]

1.(-52)/[(+2)X(-13)]
= (-52)/(-26)
= 2

2.(-12)X[(-20)/(-4)]
= (-12)X(5)
= -60

3.(+100)/[(-2)X(+5)]
=(+100)/(-10)
=-10

4.(-7.2)/[(-3.6)X(+5)]
=(-7.2)/(-18)
= 0.4

計bracket sin..
remember 乘同除都係 正負得負，負負得正