(2a²-ab+1)-2(a-2ab+3)
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(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
=2a²-ab+1-2a+4ab-6
=2a平方+3ab-2a-5
(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
(2a²-ab+1)-2(a-2ab+3)
=2a²-ab+1-2a+4ab-6
=2a平方+3ab-2a-5