I want to ask Maths

1.
[3-(-3)]{(-2)(-7-3)-[5-(-5)]}
= [3+3] {(-2)(-10)-[5+5]}
= [6] {(20) - [10]}
= [6] {10}
= 60

2.
(-3)(-24)/9(-4)
= (72) / (-36)
= -2

3.
-(-3)(3次)
= - (27)
= -27

4.
(-2)(3)(-4)(3)(-2)/(4)(-6)(-4)x(-1)(-1)(-1)(-1)/(-1)(-1)
= (-2)(3)(-4)(3)(-2) / (4)(-6)(-4) x (-1)(-1)(-1)(-1) / (-1)(-1)
= (-144) / (96) x (1) / (1)
= (-144) / (96)
= - 3/2
= -1.5

5.
(-16)x4-64÷(-2)
= (-16) x 4 - 64 ÷ (-2)
= (-64) - (-32)
= (-64) + 32
= -32

2007-08-15 14:19:18 補充：
請注意, 有括號的要先計, 然後先乘或除, 後加或減, 緊記.

2007-08-15 14:22:26 補充：
另, 第三題我打少了一個負號, 正確如下:-(-3)(3次)= - (-27)= 27又另, 樓下的有幾題沒有先乘或除, 後加或減, 又沒有看清楚有括號的部分, 所以計錯了.

1. [3-(-3)]{(-2)(-7-3)-[5-(-5)]}
=6x20-10
=110
2. (-3)(-24)/9(-4)
=72/-36
= -2
3. -(-3)(3次)
=27
4. (-2)(3)(-4)(3)(-2)/(4)(-6)(-4)x(-1)(-1)(-1)(-1)/(-1)(-1)
= -144/96x1
=-1.5
5.(-16)x4-64÷(-2)
=-64-64/(-2)
=-128/(-2)
=64
有唔明既再問啦！