0.625*6.8+8分之5*4.2-8分之5

0.625×6.8+8分之5×4.2-8分之5
=0.625×6.8+0.625×4.2-0.625
=0.625×(6.8+4.2-1)
=0.625×10
=6.25
明白请采纳,
有新问题请求助,