Zredukuj wyrazy podobne:

a) 70x – 30x =

b) 15x2 + 15x2 =


c) 3x – 12y + 5z – 9x – 11y + 9z =

d) 6a2 + 12b – 3c – 4b + b + 11c – a2 =

6 ( 2x + 3y) =

-7 ( 2xy + 4y) =

4 ( -3d + 6) =

– 2 (a – 2y) =

4a ( 2b + 6a – 3) =
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