（-4）*（-5）*0.25
=4*0.25*5
=5
100*（-3）*（-5）*0.01
=100*0.01*3*5
=15
（9分之1 - 6分之1 - 18分之1）*36
=9分之1 *36- 6分之1*36 - 18分之1*36
=4-6-2
=-4