1、(-1/6-3/20+4/5-7/12)x(-15x4)
=1/6x60+2/20x60-4/5x60+7/12x60
=10+6-48+35
=3
2、-5除(1又1/4)
=-5x4/5
=-4
3、 24除(-1/4)x(7/16)除(-1又1/5)
=24x4x7/16x5/6
=42x5/6
=35
1、(-1/6-3/20+4/5-7/12)x(-15x4)
=1/6x60+2/20x60-4/5x60+7/12x60
=10+6-48+35
=3
2、-5除(1又1/4)
=-5x4/5
=-4
3、 24除(-1/4)x(7/16)除(-1又1/5)
=24x4x7/16x5/6
=42x5/6
=35