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7.4×9.9×0.74简便计算?
展开全部
7.4×9.9×0.74
=(7.4×10-7.4×0.1)×0.74
=(74-0.74)×0.74
=70×0.74+4×0.74-0.7×0.74-0.04×0.74
=51.8+2.96-0.518-0.0296
=51.8+3-0.04-(0.518+0.0296)
=54.8-(0.04+0.5476)
=54.8-0.5876
=54.2124
=(7.4×10-7.4×0.1)×0.74
=(74-0.74)×0.74
=70×0.74+4×0.74-0.7×0.74-0.04×0.74
=51.8+2.96-0.518-0.0296
=51.8+3-0.04-(0.518+0.0296)
=54.8-(0.04+0.5476)
=54.8-0.5876
=54.2124
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