1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2

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1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^21/4a^2b-0.4ab^2-1/2a^2b+2/5ab^21/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2=1/4a^2

1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2

1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
=1/4a^2b-2/5ab^2-1/2a^2b+2/5ab^2
=1/4a^2b-1/2a^2b-2/5ab^2+2/5ab^2
=-1/4a^2b