(1减0.05)除1.9加0.1简便 4.82减5.2除0.8乘0.6简便 1.5乘[0.02除(2.1减2.09)]简
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(1减0.05)÷1.9加0.1

=0.95÷1.9+0.1

=0.5+0.1

=0.6

4.82减5.2÷0.8乘0.6

=4.82-6.5×0.6

=4.82-3.9

=0.92

1.5乘[0.02÷(2.1减2.09)]

=1.5×[0.02÷0.01]

=1.5×2

=3

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