口算下列各题5+ = 72-=-= +16 =12- =24-=+ =4- =+10= +4= 14- =9-=+9=+ =+12= +32=+ =+ =+16=+16 =+ =+0= += +12=+ = 45× =9×= × = ×100=18× =× =17× =5 × =× = ×12=×0=× = × =×12=× = 45× = 9×= × = ×100=18× =× = 17× =5 × =× = ×12= × = 45× = 9×= × =×100= 18× =× =17× =5 × = ×32=× =× =×16= ×16 =× = 5× =72×=×=×16 =12× = 24× =× = 4×=×10=×4=14× =9×=×9=45× =9×=× = ×100=18× = × =17× = 5 × = × = ×12= ×0= × = ×12=×0=× = ×12=× = 45× =9×= × =×100= 18× =× =17× =5 × = × =×12= × =45× =9×=× =×12=× = 45× =9×= × = ×100= 18× = × =6
5= 1×0
4×5=1×1
25×16= 0
05×4= 6
391= 0
03=×12= ×0= 0
08= 8- 0
4×6= 5