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12.45%1.96%0.8

解:原式=12.45-(2-0.04)-0.8 =12.45-2-0.8+0.04 =9.65+0.04 =9.69 这种方法比较简单,望采纳,谢谢

12.45-1.96-0.8 =12.45-2+0.04-1+0.2 =9.45+0.24 =9.69

12.45-1.96-0.8 =10.49-0.8 =9.69

=12.45-2+0.04-0.8 =10.45-0.76 =9.69

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