Question

1、(-25/12)÷(-5/3)x4/5 2、(-1 又3/2)÷(-5/3)÷(-0.25) 3、(-3一1又2/1)÷[3又4/3÷(2一3又3/1

1、(-25/12)÷(-5/3)x4/5 2、(-1 又3/2)÷(-5/3)÷(-0.25) 3、(-3一1又2/1)÷[3又4/3÷(2一3又3/1)x1又5/1] 4、(5/6一10/1一15/8)÷(-5/6)

Answer 1

1、(-25/12)÷(-5/3)x4/5
=5/4×4/5
=1

2、(-1 又2/3)÷(-5/3)÷(-0.25)
=1÷（-0.25）
=-4

3、(-3一1又2/1)÷[3又4/3÷(2一3又3/1)x1又5/1]
=(-4又2/1)÷[3又4/3÷(一1又3/1)x1又5/1]
=(-4又2/1)÷[-16/45x1又5/1]
=(-4/9)÷（-8/27）
=3/2

4、(5/6一10/1一15/8)÷(-5/6)
=(5/6一10/1一15/8)×(-6/5)
=-5/6×6/5+10/1×6/5+15/8×6/5
=-1+12/1+9/4
=-36/17

Answer 2

1. (-25/12)÷(-5/3)x4/5  =25/12x3/5x4/5=1

2. (-1 又3/2)÷(-5/3)÷(-0.25) =-3/5÷-5/3x4=3/5x3/5x4=9/100=11又9/1

3. (-3一1又2/1)÷[3又4/3÷(2一3又3/1)x1又5/1] =(-4又2/1)÷[4/15÷(-3/4)x5/6=2/9÷(4/15x4/3x5/6)=2/9x27/8=3/4

4. (5/6一10/1一15/8)÷(-5/6)=(30/36-30/3-30/16)÷(-5/6)=30/17x(-6/5)=-36/17