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

(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)

2222。把式子相临两项相加,分别得到2000,200,20,2,在把这四个数加起来就行了

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