6÷[(1+30%)-(1-20%)]
=6÷(130%-80%),
=6÷50%,
=12(米).
答:原来有12米.
一根绳子截去20%后,再接上6米,结果比原来的绳子还长30%,这根绳子原来多少米?
一根绳子截去20%后,再接上6米,结果比原来的绳子还长30%,这根绳子原来多少米?
数学人气:381 ℃时间:2019-10-20 19:47:01
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