Question

Упростите выражение \'1)5x+(7y-x)- (3x+7y)            2)6(a-2)-3(2a-5)  

Answer 1

1)5x+(7y-x)- (3x+7y) = 5х+7у-х-3х-7у=х   

 

2) 6(a-2)-3(2a-5)= 6а-12-6а+15=3

Answer 2

1)5x+(7y-x)-(3x+7x)

    5х+7у-х-3х-7у

    х

2) 6(a-2)-3(2a-5)

     6а-12-6а+15

      3

 

Answer 3

1) 5x + (7y - x) - (3x + 7y) = 5x + 7y - x - 3x - 7y = x - 3x + 7y - 7y = -2x
2) 6(a - 2) - 3(2a - 5) = 6a - 12 - 6a + 15 = 3