數學高手請進!!!!!!!!!!!!!!!(10點)急急急

1.

(+2)+(2/9)/(-4)*(-6)

=2+ 2/9 *(-6)/(-4)

=2+ 2/9 * 6/4

=2+ 12/36

=2+ 1/3

=7/3

2.

(-32)/(+8/9)*(-1/6)

=(-32)*(9/8)*(-1/6)

=(32)*(9/8)*(1/6)

=288/48

=6

3.

4(2x-5)/5-3=9

4(2x-5)/5=9+3

4(2x-5)/5=12

2x-5=12*5/4

2x-5=15

2x=15+5

2x=20

x=20/2

x=10

4.

x/2-x/3=x/4-5

x/2-x/3+x/4=-5

(1/2-1/3+1/4)x=-5

(6/12-4/12+3/12)x=-5

(6-4+3)x/12=-5

5x/12=5

x=5*12/5

x=12

1. 2+(+2/9÷-4)×-6
=2+(-1/18×-6)
=2+(+1/3)
=2又3分1

2. -32÷+8/9×-1/6
-36×-1/6
+6
3. 4(2x-5)=9×(5-3)
4(2x-5)=9×2
2x-5= 18÷4
2x-5 =4.5
2x =9.5
x=4.75
∴4×(2×4.75-5)÷(5-3)=9
4×(9.5-5)÷2=9
4×4.5÷2=9
9=9

4. x/2 -x/3 =x/4 -5
3x/6-2x/6=x/4 -5
x/6 =x/4 -5
x/6 -x/4= -5
4x/24-6x/24=-5
-2x/24 = -5
-2x= -5×24
-2x = -120
x = -120/-2
x=+60
∴60/2- 60/3=60/4 -5
30-20=15-5
10=10

1)
(+2)+(2/9) / (-4)X(-6)
=2又2/9 / 24
=20/9 / 24
=20/9 x 1/24
=5/54

2)
(-32) / (+8/9)X(-1/6)
=32 x 9/8 x 1/6(負負得正)
=6

3)
4(2x-5) / 5 -3=9
(8x-20) / 5-3+3=9+3
(8x-20) / 5 x5=12x5
8x-20+20=60+20
8x=80
x=10

4)
x/2 - x/3= x/4 -5
6x/12 - 4x/12 - 3x/12=-5
-x/12 x(-12)=-5x(-12)
x=60

1) (+2)+(2/9)除(-4)X(-6)
=2 + 2/9 (24)
=2+ 2/9 (1/24)
=2+19/72
=163/72


2) (-32)除(+8/9)X(-1/6)
=-32 成 9/8 x (-1/6)
=-36 x (-1/6_
=6

3) 4(2x-5) / 5 -3=9

8x - 20 /5=12
8x-20 =60
8x=80
x=10

4) x/2 - x/3= x/4 -5


12[x/2 - x/3]=12[ x/4 -5]
6x - 4x=3x -60
2x-3x=-60
x=60

2007-01-15 20:21:04 補充：
1 (+2)+(2/9)除(-4)X(-6)=2 + 2/9除 (24)=2+ 2/9 (1/24)=2+1/108=217/108呢係咁至岩...sorry~