Question

(x+y)-(x-y)

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Answer 1

(x+y)-(x-y)=x+y-x+y=(x-x)+(y+y)=0+2y=2y

Answer 2

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Answer 3

(x+y)-(x-y)

=x+y-x+y=y+y=2y (phá ngoặc)

vậy (x+y)-(x-y)=2y

Answer 4

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Answer 5

(x+y) - (x-y) = x+y - x + y = ( x-x) + ( y+y) = 0 + 2y = 2y 

Answer 6

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Answer 7

(x+y)-(x-y)=x+y-x+y=y+y=2y

vậy (x+y)-(x-y)=2y

Answer 8

(x+y)-(x-y)=x+y-x+y=y+y=2y

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