15-（0.6+1/6)+2/9 8.2-（1.375+1 7/10) 10 5/12×6 2/3+2 9.1/2
=15-（3/5+1/6）+2/9 =8.2-（1.375+1.7） =1085/6+29.1/2
=15-（18/30+5/30）+2/9 =8.2-3.075 =1085/6+87.3/6
=15-23/30+2/9 =5.125 =1172.3/6
=1350/90-69/90+20/90
=1301/90
105/12×62/3+29/12 10 4/5-3 5/6-4.75
= 2170/12+29/12 =104/5-35/6-19/4
=2199/12 =1248/60-350/60-285/60
=183.25 =613/60
3.75×0.12=0.44
3.75 驗(yàn) 0.12
×0.12 ×3.75
———— 算————
750
375
——
4400