X-Y等于5.XY等于3.那么3XY-7X+7Y
问题描述:
X-Y等于5.XY等于3.那么3XY-7X+7Y
答
3XY-7X+7Y
=3*3-7(x-y)
=9-7*5
=-26
X-Y等于5.XY等于3.那么3XY-7X+7Y
3XY-7X+7Y
=3*3-7(x-y)
=9-7*5
=-26