P.6-F.1正負數問題(20分)

2007-08-31 4:45 am
1.(-1)-(-3)+(+9)

2.x=-3,y=2
a.3y分之x
b.y-x
c.2x+y
d.4xy

3.a=-2,b=3,c=-1
a.abc
b.-a-(-b)+c
c.2a-b-c
d.c分之a+b

Please help me!!!!!!!!!!

回答 (4)

2007-08-31 4:56 am
✔ 最佳答案
1)11
2a)-1/2
b)5
c)-4
d)-24
3a)6
b)4
c)-6
d)-1
你要step的話再問吧
2007-08-31 5:44 am
1.(-1)-(-3)+(+9)

= -1+3+9

=11



2a.=3Y分之X

=6分之-3

=-6分之3


b.=2-3

=-1

c.=2(-3)+2

=-6+2

=-4

d.=4(-3)2

=-24


3a.=(-2)3(-1)

=-6(-1)

=6

b.=2+3-1

=4

c.=2(-2)-3-(-1)

=-4-3+1

=-6


d.=-1分之-2+3

=-1分之1

=-1
2007-08-31 5:01 am
1.(-1)-(-3)+(+9)
=-1+3+9
=11

2.x=-3,y=2
a.3y分之x
=-3/3(2)
-1/2

b.y-x
=2+3
=5

c.2x+y
=2x(-3)+2
=-6+2
=-4

d.4xy
=4x(-3)x2
=-24

3.a=-2,b=3,c=-1
a.abc
=(-2)(3)(-1)
=6
b.-a-(-b)+c
=2-(-3)-1
=4

c.2a-b-c
=2(-2)-3+1
=-6

d.c分之a+b
=(-2+3)/-1
=-1
2007-08-31 5:00 am
1. -1+3+9 = 11

2. a. -3/(3x2) = -1/2
b. 2-(-3) = 5
c. 2(-3)+2 = -4
d. 4(-3)(2) = -24

3.a. (-2)(3)(-1) = 6
b. -(-2)-(-3)+(-1) = 2+3-1 = 4
c. 2(-2)-3-(-1) = -4-3+1= -6
d. (-2+3)/(-1) = -1


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