(9.9+0.1-9.9+0.1)除以0.01
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(9.9+0.1-9.9+0.1)除以0.01(9.9+0.1-9.9+0.1)除以0.01(9.9+0.1-9.9+0.1)除以0.01(9.9+0.1-9.9+0.1)÷0.01=0.2÷0.01
(9.9+0.1-9.9+0.1)除以0.01
(9.9+0.1-9.9+0.1)除以0.01
(9.9+0.1-9.9+0.1)除以0.01
(9.9+0.1-9.9+0.1)÷ 0.01
=0.2÷0.01
=20
(9.9+0.1-9.9+0.1)除以0.01
=(990+10-990+10)
=20