8/1乘7/5-8/1乘7/4
=8/1×(7/5-7/4)
=8/1×7/1
=56/1
15/8-5/4乘15/8
=15/8×(1-5/4)
=15/8×5/1
=75/8
3/2乘13/3乘6乘26
=13/3×6×26
=13/18×26
=36
82乘11/3乘41/1
=82×41/1×11/3
=2×11/3
=11/6
8/1乘7/5-8/1乘7/4
=8/1×(7/5-7/4)
=8/1×7/1
=56/1
15/8-5/4乘15/8
=15/8×(1-5/4)
=15/8×5/1
=75/8
3/2乘13/3乘6乘26
=13/3×6×26
=13/18×26
=36
82乘11/3乘41/1
=82×41/1×11/3
=2×11/3
=11/6