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b)3mn+ 1(-m-n)=3
c)2x²-2x(x-1).=2x
d)a²-b²+1(-1-1)=b²-a²
e)-pq-q+ 1(3pq+q)=-2pq
f)x²-2y²+1(-x^2+2y^2+2xy)=2xy
a)½a²+⅓a²+⅙a²-2a²= 3/6a^2+2/6a^2+1/6a^2-2a^2=1a^2-2a^2=-1a^2