题目内容
【题目】化简
(1)2x2+1-3x+7-2x2+5x
(2)x+(5x-3y)-(x-2y)
【答案】(1) 2x+8(2) 5x-y
【解析】
(1)直接合并同类项即可;
(2)先去括号,再合并同类项即可.
(1)2x2+1-3x+7-2x2+5x
=(2x2-2x2)+(1+7)+(-3x+5x)
=2x+8
(2)x+(5x-3y)-(x-2y)
= x+5x-3y-x+2y
=5x-y
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题目内容
【题目】化简
(1)2x2+1-3x+7-2x2+5x
(2)x+(5x-3y)-(x-2y)
【答案】(1) 2x+8(2) 5x-y
【解析】
(1)直接合并同类项即可;
(2)先去括号,再合并同类项即可.
(1)2x2+1-3x+7-2x2+5x
=(2x2-2x2)+(1+7)+(-3x+5x)
=2x+8
(2)x+(5x-3y)-(x-2y)
= x+5x-3y-x+2y
=5x-y