1) (3х-1)+(2-5х) = 3х-1+2-5х= -2х+1 (ну или 1-2х)
2) 3b- (-b+a) = 3b+b-a = 4b+a
3) (6x²+x) + (-x²+2x) = 6x²+x-x²+2x= 5x²+3x
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Answers & Comments
1) (3х-1)+(2-5х) = 3х-1+2-5х= -2х+1 (ну или 1-2х)
2) 3b- (-b+a) = 3b+b-a = 4b+a
3) (6x²+x) + (-x²+2x) = 6x²+x-x²+2x= 5x²+3x