9分之5x8+9分之5x2
=40/9+10/9
=50/9
(10分之7+4分之3)吵派x5
=5*7/10+5*3/4
=7/2+15/4
=14/4+15/唤渗4
=29/4
135x9分之8x4分之3
=135*8/9 * 3/4
=135*8*3/(9*4)
=15*2*3/1
=90
11分之6x8分之7—8分之升链贺6x11分之6
=6/11 * 7/8 - 6/8 * 6/11
=6/11 *(7/8-6/8)
=6/11*1/8
=3/44
(21+5分之2)x7分之5
=21*5/7+ 2/5 * 5/7
=15+2/7
=15又2/7
5分之2x15x10分之1
=2/5 *15* 1/10
=2*15*1/(5*10)
=3/5
50/9 17/4 90 3/44 107/7 6/5