修一条水梁,已经修了全程的35%,离中点还差4.8千米.已经修了多少米?

问题描述:

修一条水梁,已经修了全程的35%,离中点还差4.8千米.已经修了多少米?

4.8÷(1/2-35%)×35%
=4.8÷15%×35%
=32×35%
=11.2千米
答已经修了11.2千米