7/16乘9减7乘7/16
=7/16*(9-7)
=7/16*2
=7/8
2 1/7除15/28乘1 5/21
=15/7*28/15*26/21
=104/21
3 5/8加4 7/8减1.625减2 3/8
=3+4-1-2+(5/8+7/8-5/8-3/8)
=4.5
(3/4减1/2减1/6)乘12
=3/4*12-1/2*12-1/6*12
=9-6-2
=1
7/16乘9减7乘7/16
=7/16*(9-7)
=7/16*2
=7/8
2 1/7除15/28乘1 5/21
=15/7*28/15*26/21
=104/21
3 5/8加4 7/8减1.625减2 3/8
=3+4-1-2+(5/8+7/8-5/8-3/8)
=4.5
(3/4减1/2减1/6)乘12
=3/4*12-1/2*12-1/6*12
=9-6-2
=1