3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(脱式的)大哥大姐,帮帮忙吧,作业啊!急!

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3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(脱式的)大哥大姐,帮帮忙吧,作业啊!急!3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(

3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(脱式的)大哥大姐,帮帮忙吧,作业啊!急!
3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(脱式的)
大哥大姐,帮帮忙吧,作业啊!急!

3.75*0.5+6.25/2和(81.4-3.75)/2.5/4怎么简便计算(脱式的)大哥大姐,帮帮忙吧,作业啊!急!
3.75*0.5+6.25/2
=1.25*1.5+1.25*2.5
=1.25*(1.5+2.5)
=1.25×4
=5
(81.4-3.75)/2.5/4
=77.65/(2.5×4)
=77.65/10
=7.765