Question

if a:b=2:5, find (3a^-2ab+5b^):(a^+7ab-2b^)​

Answer 1

Step-by-step explanation:

Given, a:b=2:5

Could be written as

Ba = 52

So, 5a=2b

a=152b

Put the value of a in 4a+b 3a+2 = 4( 52 )+b

3(

5

2b

)+2b

=

5

8b+5b

5

6b+10b

=

5

13b

5

16b

=

5

16b

×

13b

5

=

13b

16b

=

13

16

Answer 2

Given, a : b = 2:5

Could be written as a b 2 5

So, 5a = 2b

2b 5 a=

Put the value of a in 3a + 2b

4a + b

2b 5 2b 5 3 +2b + b = 4

6b+10b 5 8b+5b 5 =

16b

= 5 13b

5

16b 5 = 5 13b X

16b 13b =

16 13