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13.7x0.25+1.32x1.7简便算法?
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13.7×0.25+1.32×1.7
=12×0.25+1.7×0.25+1.32×1.7
=3×4×0.25+1.7×(0.25+1.32)
=3×1+2×1.57-0.3×1.57
=3+3.14-0.471
=6.14-1+0.529
=5.14+0.529
=5.669
=12×0.25+1.7×0.25+1.32×1.7
=3×4×0.25+1.7×(0.25+1.32)
=3×1+2×1.57-0.3×1.57
=3+3.14-0.471
=6.14-1+0.529
=5.14+0.529
=5.669
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