首先:ordered pairs of positive integers 这里的有序是必须递增的么,就是说1,0不对0,1就对了?for how many ordered pairs of positive integers(x,y) is 2x+3y
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首先:ordered pairs of positive integers 这里的有序是必须递增的么,就是说1,0不对0,1就对了?for how many ordered pairs of positive integers(x,y) is 2x+3y
首先:ordered pairs of positive integers 这里的有序是必须递增的么,就是说1,0不对
0,1就对了?
for how many ordered pairs of positive integers(x,y) is 2x+3y
首先:ordered pairs of positive integers 这里的有序是必须递增的么,就是说1,0不对0,1就对了?for how many ordered pairs of positive integers(x,y) is 2x+3y
楼主理解有偏颇,所谓有序,只不过是(x,y)中一个在左,就是x
一个在右,就是y而已.有序 就是有左右的顺序,而非大小顺序,
这两个数,大小无所谓,谁在左都行,
本题中 ,完全可以取x=y=1