2011²-4022×2012+2012² 用公式计算
2011²-4022×2012+2012² 用公式计算
计算
(2x+y-3)²
计算
(2x+y-3)²
数学人气:791 ℃时间:2020-04-23 15:55:33
优质解答
2011²-4022×2012+2012²=2011²-2x2011×2012+2012²=(2011-2012)²=(-1)²=1(2x+y-3)²=(2x+y)²-3(2x+y)+9=4x²+4xy+y²-6x-3y+9
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