题目内容
合并同类项:
(1)2x-4x+5x2-7x-5;
(2) 4xy2-3xy2+6x2y
(1)2x-4x+5x2-7x-5;
(2) 4xy2-3xy2+6x2y
解:(1)2x2-4x+5x2-7x-5
=(2+5)x2-(4+7)x-5
=7x2-11x-5.
(2)4xy2-3xy2+6x2y
=(4-3)xy2+6x2y
=xy2+6x2y.
=(2+5)x2-(4+7)x-5
=7x2-11x-5.
(2)4xy2-3xy2+6x2y
=(4-3)xy2+6x2y
=xy2+6x2y.
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