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Mathematics, heaven and earth, people's education edition, grade seven. Low intensity training
Dear, the topics in the newspaper are basically found by teachers, some are original, some are just changed numbers or conditions, and some may be original.

I really can't see other issues clearly.

This is the last question for you.

18. Solution:

(1)CD is parallel to the X axis, then the ordinate of point C is equal to d, that is, n=5.

(2) If (2)CD is parallel to the Y axis, the abscissa of point C is equal to d, that is, m- 1=3 and m=4.

To sum up, m=4 and n=5.

I wish you progress in your study! ! !

Hope to adopt thank you! ! !