急問3題數學題~10!!

1. px+pr-qx-qr=px-pr+qx-qr
2pr-2qx=0
pr-qx=0
2 . 620=500(1+6r/100)
620/500=1+6r/100
(620/100-1)x100/6=r
r =520/6
=260/3
3. 4c-ab=kabc
4c-ab+kabc=o
4c-b(a-kac)=0
b=4c/a-kac
hard working!

第一題不明白問什麼

2. C=620 P=500 n=6
C=P(1+nr/100) find r
620=500( 1+ 6r/100 )
620=500+30r
30r=120
r=40

3. k=4/ab-1/c find b
abck=4c - ab
abck + ab = 4ck
b( ack + a ) = 4ck
b = 4ck / (ack+a)
b = 4ck / a(ck+1)

我只解出第二題

620= 500(1+ 6r/100)
620/500 = 1+ 6r/100
620/500 - 1 = 6r/100
12/50 = 6r/100
12/50 x 100 = 6r
6r = 24
r = 4

ed澳數好難boo(奇),
上面的二位小朋友好傻,澳數(中學程度的數)都唔識,仲話ed係英文,唉,真係...

2.620=500(1+6r/100)
620=500+30r
120=30r
r = 4
3. k=4/ab-1/c
abc=4ck-abk
4ck=-abk-abc
4ck=b(-ak-ac)
b= 4ck/-a(k+c)

Sorry I do not know what are you say ?

I do not know what are you say ?
Your 問題 is English not Maths.