如果,(x-2y-3)²+ |2x+y-1 |=0,那么3x-y=?
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![如果,(x-2y-3)²+ |2x+y-1 |=0,那么3x-y=?](/uploads/image/z/582926-14-6.jpg?t=%E5%A6%82%E6%9E%9C%2C%EF%BC%88x-2y-3%29%26%23178%3B%2B+%7C2x%2By-1+%7C%3D0%2C%E9%82%A3%E4%B9%883x-y%3D%3F)
如果,(x-2y-3)²+ |2x+y-1 |=0,那么3x-y=?
如果,(x-2y-3)²+ |2x+y-1 |=0,那么3x-y=?
如果,(x-2y-3)²+ |2x+y-1 |=0,那么3x-y=?
x-2y-3=0;(1)
2x+y-1=0;(2)
(1)+(2)*2得:5x-5=0;
x=1;
y=-1;
3x-y=3+1=4;
平方和绝对值都大于等于零,而它们的和为零,说明两项均为零