[14.8+(3又2/7-1.5)*1又3/25]/4又1/5

[14.8+(3又2/7-1.5)*1又3/25]/4又1/5
[14.8+(3又2/7-1.5)*1又3/25]/4又1/5

[14.8+(3又2/7-1.5)*1又3/25]/4又1/5
[14.8+(3又2/7-1.5)×1又3/25]/4又1/5
=[74/5+(23/7-3/2)×28/25]÷21/5
=[74/5+(46/14-21/14)×28/25]×5/21
=(74/5+25/14×28/25)×5/21
=(74/5+2)×5/21
=(74/5+10/5)×5/21
=84/5×5/21
=4