21.2-9.96-0.4=11.2+0.04-0.4=10.8+0.04=10.84
21.2-9.96-0.4=21+0.2-10+0.04-0.4=11+0.04-0.2=10+1-0.2+0.04=10+0.8+0.04=10.84
21.2一9.96一0.04等于多少?21.2-9.96-0.04=21.2-(9.96+0.04)=21.2-10=11.2
21.2-9.96-0.4=11.24-0.4=10.84