中一正負數

#1
(-5 - 1/3)(1/9) - (1 + 5/6)(-2 - 3/4)
= (-16/3)(1/9) - (11/6)(-11/4)
= -16/27 + 121/24
= -16*8/216 + 121*9/216
= (121*9 - 16*8)/216
= 961/216
= 4 + 97/216
= 4又216分97

#2
(-2/3)(-4)^2 - 6^2 (-3/7)
= (-2/3)(16) - 36(-3/7)
= - 32/3 + 108/7
= -32*7/21 + 108*3/21
= (108*3 - 32*7)/21
= 100/21
= 4+16/21
= 4又21分16


2011-10-08 15:07:26 補充：
-5²(12-2)+(2-6)²
= -25(10) + (-4)²
= -250 + 16
= -234

2011-10-08 15:08:20 補充：
(-4)^3(-3) ─〔3(-8)+10〕^3
= -64(-3) - (-24+10)^3
= 192 - (-12)^3
= 192 + 1728
= 1920

2011-10-09 18:39:46 補充：
(2-8)x3+(-16)÷(-2²)
= (-6)*3 - 16/(-4)
= -18 + 16/4
= -18 + 4
= -14

0/1-(2/3-1/2)÷(-1/5)
= 0 - (4/6 - 3/6)/(-1/5)
= (1/6)/(1/5)
= 5/6

0.75 -〔1/2x(-2/3)-0.5÷(-2)〕
= 3/4 - (1/2 * (-2/3) - (1/2)/(-2))
= 3/4 - (-1/3 + 1/4)
= 3/4 - (-4/12 + 3/12)
= 9/12 - (-1/12)
= 9/12 + 1/12
= 10/12
= 5/6

1.
(-5又3分1)(9分1)-(1又6分5)(-2又4分3)
=(-16/3)(1/9)-(11/6)(-1/4)
=-16/27+121/24
=961/216

2.
-2/3(-4)^2-6^2 (-3/7)
=16(-2/3)-36(-3/7)
=-32/3+108/7
=100/21

3.
-5²(12-2)+(2-6)²
=-25(10)+(-4)^2
=-250+16
=-234

4.
(-4)^3(-3) ─〔3(-8)+10〕^3
=-64(-3)-(-24+10)^3
=192-(-14)^3
=192-(-2744)
=2936