9.37+9.37+9.37+9.37*2.5(简算）8.9*34+8.9*53+8.

9.37+9.37+9.37+9.37*2.5
=9.37*1+9.37*1+9.37*1+9.37*2.5
=9.37*(1+1+1+2.5)
=9.37*5.5
=9.37*5+9.37*0.5
=46.85+4.685
=51.535
8.9*34+8.9*53+8.9*14
=8.9*34+8.9*53+8.9*13+8.9
=8.9*(34+53+13)+8.9
=8.9*100+8.9*1
=890+8.9
=898.9