1：(9.37+9.37+9.37+9.37)×1.9×2.5
=9.37*4*1.9*2.5
=(9.37*2-9.37*0.1)*2.5*4
2：8.53-0.13×8
=9-0.47-0.13*10-0.13*2
3：4.12×10.1
=4.12*10+4.12*0.1
4：3.78×0.5-0.65
=
很久没做这个了,最后一题不会.