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= a+4b-5-2a-3b+5=
=-a+b
b) (-a²+2ab-1)-1)+(a²-4ab+5) =
= -a²+2ab-1-1+a²-4ab+5=
=-2ab-1-1+5=
=-2ab+3
(a+4b)-(5+2a)-(3b-5)
a+4b-5-2a-3b+5
-a+b
b)
(-a²+2ab-1)-1)+(a²-4ab+5)
-a²+2ab-1-1+a²-4ab+5
-2ab+3=