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Tohaina

2a^{2}-ab+2ba-b^{2}+\left(2a+b\right)\left(a-2b\right)
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o a+b ki ia tau o 2a-b.
2a^{2}+ab-b^{2}+\left(2a+b\right)\left(a-2b\right)
Pahekotia te -ab me 2ba, ka ab.
2a^{2}+ab-b^{2}+2a^{2}-4ab+ba-2b^{2}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 2a+b ki ia tau o a-2b.
2a^{2}+ab-b^{2}+2a^{2}-3ab-2b^{2}
Pahekotia te -4ab me ba, ka -3ab.
4a^{2}+ab-b^{2}-3ab-2b^{2}
Pahekotia te 2a^{2} me 2a^{2}, ka 4a^{2}.
4a^{2}-2ab-b^{2}-2b^{2}
Pahekotia te ab me -3ab, ka -2ab.
4a^{2}-2ab-3b^{2}
Pahekotia te -b^{2} me -2b^{2}, ka -3b^{2}.
2a^{2}-ab+2ba-b^{2}+\left(2a+b\right)\left(a-2b\right)
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o a+b ki ia tau o 2a-b.
2a^{2}+ab-b^{2}+\left(2a+b\right)\left(a-2b\right)
Pahekotia te -ab me 2ba, ka ab.
2a^{2}+ab-b^{2}+2a^{2}-4ab+ba-2b^{2}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 2a+b ki ia tau o a-2b.
2a^{2}+ab-b^{2}+2a^{2}-3ab-2b^{2}
Pahekotia te -4ab me ba, ka -3ab.
4a^{2}+ab-b^{2}-3ab-2b^{2}
Pahekotia te 2a^{2} me 2a^{2}, ka 4a^{2}.
4a^{2}-2ab-b^{2}-2b^{2}
Pahekotia te ab me -3ab, ka -2ab.
4a^{2}-2ab-3b^{2}
Pahekotia te -b^{2} me -2b^{2}, ka -3b^{2}.