December 2018 1 49 Report
1. (-5x+9y+5) + (-8x-2y-12) = ....
2. (6a²b-3ab²-7ab) - (5a²b+4ab²-5ab) =...
3. (9a-7b+15)- (-3a+b+6) = ...
4. (5x²+7xy-8y²) + (6x²-12xy-2y²) =…
5. (6a²+3b-4c) - (7b-4a²+5c) =…
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