如题所述
原式=6.58x5x0.9x0.9
=3.29x0.81
=（3+0.3-0.01）x0.81
=3x0.81+0.3x0.81-0.01x0.81
=2.43+0.243-0.0081
=2.673-0.0081
=2.6649
=3.29x0.81
=（3+0.3-0.01）x0.81
=3x0.81+0.3x0.81-0.01x0.81
=2.43+0.243-0.0081
=2.673-0.0081
=2.6649
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第1个回答 2019-10-05
原式变为:6.58X1/2X9Ⅹ(1－0.1)
=3.29X(10－1)x(1－0.1)
=(32.9－3.29)X(1－0.1)
=29.61－2.961
=26.649
=3.29X(10－1)x(1－0.1)
=(32.9－3.29)X(1－0.1)
=29.61－2.961
=26.649
第2个回答 2019-10-05
6.58×4.5×0.9
=3.29×（2×4.5）×0.9
=3.29×9×0.9
=3.3×8.1-0.01×8.1
=3.3×8+3.3×0.1-0.081
=26.4+0.33-0.081
=26.4+0.249
=26.649本回答被网友采纳
=3.29×（2×4.5）×0.9
=3.29×9×0.9
=3.3×8.1-0.01×8.1
=3.3×8+3.3×0.1-0.081
=26.4+0.33-0.081
=26.4+0.249
=26.649本回答被网友采纳
