700
610,601
520,502,511
430,403,412,421
304,340,313,331,322
205,250,214,241,223,232
106,160,115,151,124,142,133
28个
介于100和1000之间的整数中有多少个数的各位数字之和等于7?
700
610,601
520,502,511
430,403,412,421
304,340,313,331,322
205,250,214,241,223,232
106,160,115,151,124,142,133
28个