27.9×9.9+2.79 简便计算 求各位高手帮帮忙!!!!!!!!!!!!!!!!!!!!!!
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27.9×9.9+2.79
=27.9×9.9+27.9×0.1
=27.9×(0.1+9.9)
=27.9×10
=279
=27.9×9.9+27.9×0.1
=27.9×(0.1+9.9)
=27.9×10
=279
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27.9×9.9+2.79
=27.9×9.9+27.9×0.1
=27.9×(9.9+0.1)
=27.9×10
=279
=27.9×9.9+27.9×0.1
=27.9×(9.9+0.1)
=27.9×10
=279
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27.9x9.9+2.79
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279
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27.9*(9.9+0.1)=279
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27.9×(10-0.1)+2.79
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