求大神帮我减简便运算!4/5-1/4+8/9*2/39-(1/2*5/18+1/5)7/8×125×16/7×4

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求大神帮我减简便运算!4/5-1/4+8/9*2/39-(1/2*5/18+1/5)7/8×125×16/7×4
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求大神帮我减简便运算!4/5-1/4+8/9*2/39-(1/2*5/18+1/5)7/8×125×16/7×4
求大神帮我减简便运算!
4/5-1/4+8/9*2/3
9-(1/2*5/18+1/5)
7/8×125×16/7×4

求大神帮我减简便运算!4/5-1/4+8/9*2/39-(1/2*5/18+1/5)7/8×125×16/7×4
4/5-1/4+8/9*2/3
=11/20+16/27
=617/540
9-(1/2*5/18+1/5)
=9-(5/18+1/5)
=9-43/90
=8又47/90
7/8×125×16/7×4
=(7/8×16/7)×(125×4)
=2×500
=1000