1/a+2/b+3/c; express as a single fraction.

For this case we must express as a single fraction the following expression:

We have that the common denominator of the three fractions is given by: abc

So, to express as a fraction we divide abc by each denominator and multiply by each numerator, obtaining:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6