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2b-(b+2a+1) =
= 2b - b - 2a - 1 =
= b - 2a - 1
b)
(2a-3b)-(4a-5b) =
= 2a - 3b - 4a + 5b =
= -2a + 2b
c)
-8(-3-7y+2x) =
= 24 + 56y - 16x
d)
5x²(x³+3x-1) =
= 5x⁵ + 15x³ - 5x²
b) 2a-3b-4a+5b=2b-2a
c) 24+56b-16a
d) 5x^5+15x^3-5x^2
(2a-3b)-(4a-5b)=2a-3b-4a+5b= -2a+2b
-8(-3-7y+2x)=24+56y-16x
5x²(x³+3x-1)=5x⁵+15x³-5x²