题目内容
化简:
(1)5a-3b-(2a-4b)
(2)(-3x2-xy-2y2)-2(x2+xy-2y2)
(1)5a-3b-(2a-4b)
(2)(-3x2-xy-2y2)-2(x2+xy-2y2)
(1)原式=5a-3b-2a+4b=3a+b;
(2)原式=(-3x2-xy-2y2)-(2x2+2xy-4y2)=-3x2-xy-2y2-2x2-2xy+4y2=-y2-3xy-2x2.
(2)原式=(-3x2-xy-2y2)-(2x2+2xy-4y2)=-3x2-xy-2y2-2x2-2xy+4y2=-y2-3xy-2x2.
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