3/7×1/4+25%×2/7+0.25×1/7简便算法
4个回答
3/7×1/4+25%×2/7+0.25×1/7
=3/7×1/4+1/4×2/7+1/4×1/7
=1/4×(3/7+2/7+1/7)
=1/4×6/7
=3/14
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