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> 先化简再计算:,其中x=3,y=2。-九年级数学
先化简再计算:,其中x=3,y=2。-九年级数学
题目简介
先化简再计算:,其中x=3,y=2。-九年级数学
题目详情
先化简再计算:
,其中x=3,y=2。
题型:计算题
难度:中档
来源:湖南省中考真题
答案
解:原式=
=x+y-2x+y
=-x+2y
因为x=3,y=2
所以原式=-3+4=1。
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题目简介
先化简再计算:,其中x=3,y=2。-九年级数学
题目详情
答案
=x+y-2x+y
=-x+2y
因为x=3,y=2
所以原式=-3+4=1。