来自郭陵之的问题
【(1)计算:|-5|+4+2-1-sin30°;(2)计算:(x-y+4xyx−y)(x+y-4xyx+y).】
(1)计算:|-5|+
4+2-1-sin30°;
(2)计算:(x-y+4xyx−y)( x+y-4xyx+y).
1回答
2020-03-17 09:01
【(1)计算:|-5|+4+2-1-sin30°;(2)计算:(x-y+4xyx−y)(x+y-4xyx+y).】
(1)计算:|-5|+
4+2-1-sin30°;
(2)计算:(x-y+4xyx−y)( x+y-4xyx+y).
(1)原式=5+2+12−12