如题所述
9.9×(5.4+5.4-1)
=9.9×9.8
=(10-0.1)×9.8
=98-0.1×9.8
=98-98-0.98
=97.02追问
=9.9×9.8
=(10-0.1)×9.8
=98-0.1×9.8
=98-98-0.98
=97.02追问
0、9X1、1x1、01x1、0001=
追答(1-0.1)(1+0.1)(1+0.001)(1+0.0001)
=(1-0.01)(1+0.01)(1+0.001)
=(1-0.001)(1+0.01)(1+0.0001)
=(1-0.0001)(1+0.0001)
=1-0.0000000001
=0.99999999
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