(-1/63)÷(1/9-2/7+2/3-4/21)
问题描述:
(-1/63)÷(1/9-2/7+2/3-4/21)
答
(-1/63)÷(1/9-2/7+2/3-4/21)
= (-1/63)÷(1/9-6/21+6/9-4/21)
= (-1/63)÷(7/9-10/21)
= (-1/63)÷(49/63-30/63)
= (-1/63)÷(19/63)
=-1/19