Question

4/9-5/8+3/5-4/9+3/8-4/5=？

请写出过程，用先把减法转化成加法的方式算

Answer 1

4/9-5/8+3/5-4/9+3/8-4/5
=(4/9-4/9)+(3/8-5/8)+(3/5-4/5)
=0-1/4-1/5
=-0.25-0.2
=-0.45

Answer 2

4/9-5/8+3/5-4/9+3/8-4/5
=(4/9-4/9)+(-5/8+3/8)+(3/5-4/5)
=0+(-1/4)+(-1/5)
=-9/20

Answer 3

4/9-5/8-4/9+3/8