Question

Sum of xy, x + y and y + xy is

Answer 1

Answer:

2xy + 2y+ x

Step-by-step explanation:

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Answer 2

Answer :

20(x-18y)

Solution :

a=(x+y) and d= ( x-y) -(x +y) =-2y

S20=202x[2a+(20−1)d]=10×[2(x+y)+190×(−2y)]=20(x−18y)