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1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 ...

1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 =(1000.9+999.1)+(99.91+100.09)+10.009+(1.0009+0.9991) =2000+200+10.009 +2 =2212.009

(1)原式=1.0009×(1000+100+10+1)+0.9991×(1000+100+10+1) =1111×(1.009+0.9991) =2222(2)原式=3.33×2.4+3.33×7.6=33.3(3)原式=(23.4+0.1)×5.66-23.4 ×(5.66+0.01) =23.4×5.66 +5.66×0.l-23.4×5 66-23.4×0.01 =0.332(4)原式 =...

(1000.9+999.1)+(99.91+100.09)+(10.009+9.991)+(1.0009+0.9991)

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