(1800-20)÷(1-1/2)=3560个(3560+80)÷(1-1/3)=5460个(5460-150)÷(1-1/4)=7080个(70800+120)÷(1-1/5)=9600个这批零件的总数有9600个
(1800-20)÷(1-1/2)=3560(个)(3560+80÷)(1-1/3)=5460(个·)(5460-150)÷(1-1/4)=7080(个·)(7080+120)÷(1-1/4)=9600(个)
做任务ing