又是一道英文数学题, 求高手解答!~For how many ordered pairs of positive integers (x,y) is 2x+3y

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又是一道英文数学题, 求高手解答!~For how many ordered pairs of positive integers (x,y) is 2x+3y
又是一道英文数学题, 求高手解答!~
For how many ordered pairs of positive integers (x,y) is 2x+3y

又是一道英文数学题, 求高手解答!~For how many ordered pairs of positive integers (x,y) is 2x+3y
可以.ordered pairs 就是说这个pair的顺序是(x,y).