问题
计算题
合并同类项:
(1)2x-4x+5x2-7x-5;
(2) 4xy2-3xy2+6x2y
答案
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.
合并同类项:
(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.