3.33*1.6+6.66*4.2怎么简便运算
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3.33*1.6+6.66*4.2

=3.33×2×0.8+6.66×4.2

=6.66×0.8+6.66×4.2

=6.66×(0.8+4.2)

=6.66×5

=3.33×(2×5)

=33.3

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