能被7整除的：7,14,21,28,35,42,49,56,63,70,77,84,91,98,105,112,119,126,133,140,147,154,161,168,175,182,189,196 共有28个含7的：7,17,27,37,47,57,67,87,97,107,117,127,137,147,157,167,187,197,70,71,72,73,7...