Question

{(+4分之7)-(-8分之7)+(-7分之12)}+(-8分支7) 的值

Answer 1

原式=(+4/7)+(+7/8)+(-7/12)+(-7/8)

=[(+7/8)+(-7/8)]+[(+4/7)+(-7/12)]

=0+(+48/84)+(-49/84)

= -(49/84-48/84)

= -1/84