Help Me!!!送20點 too

Good!

1a. ((3p)(-4p))/2p
=-6p
1b. 2a(15a-4a)
=22a^2
2a. 7x-6-2(3x - 1)
=x-4
2b. 6a - 5a + 13a
=14a
3a. (r/5)-(r/6)
=r/30
3b. (b/3)+(2b/6)+(b/9)
=7b/9

1a. ((3p)(-4p))/2p
=(-12p^2)/(2p)
=-6p
1b. 2a(15a-4a)
=22a^2
2a. 7x-6-2(3x - 1)
=7x-6-6x+2
=x-4
2b. 6a - 5a + 13a
=a(6-5+13)
=14a
3a. (r/5)-(r/6)
=(6r/30)-(5r/30)
=r/30
3b. (b/3)+(2b/6)+(b/9)
=(6b/18)+(6b/18)+(2b/18)
=14b/18
=7b/9

1a) -6p
1b) 22a*2 (*2 = 二次方)
2a) x - 4
2b) 14a
3a) r/30
3b) 7b/9

(3p) x (-4p) -12p^2
1a) ------------------ = ----------- = -6p
2p 2p

1b) (15a - 4a) x 2a = 11a x 2a = 22a^2

2a) 7x - 6 - 2(3x - 1) = 7x - 6 - 6x - 2 = x - 8

2b) 6a - 5a + 13a = a + 13a = 14a

r r 6r - 5r r
3a) -- - -- = -------- = ---
5 6 30 30

b 2b b 6b 6b 2b 14b 7b
3b) -- + -- + -- = --- + --- + --- = ----- = ---
3 6 9 18 18 18 18 9

1)-6p
2)18(axa) a)13x-7 b)14a
3) r
------
30

4) 7b
----------
9

(1)(3p) x (-4p)=-12p^2

(2)(15a - 4a) x 2a=22a^2．b

(3)7x - 6 - 2(3x - 1)=7x-6-6x+2=x-4

(4)6a - 5a + 13a=12a

最後2題不懂怎樣做^^'