2.22×10.3-6.66用简便方法怎么计算？
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2.22×10.3-6.66
=2.22×10.3-2.22×3
=2.22×(10.3-3)
=2.22×7.3
=2.22×(7+0.3)
=2.22×7+2.22×0.3
=15.54+0.666
=16.206
=2.22×10.3-2.22×3
=2.22×(10.3-3)
=2.22×7.3
=2.22×(7+0.3)
=2.22×7+2.22×0.3
=15.54+0.666
=16.206
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