(1/4×1/7+1/7×1/10+1/10×1/13+1/13×1/16)×3
=1/3*(1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16)×3
=1/4-1/16
=3/16
数学题：(1/4×1/7+1/7×1/10+1/10×1/13+1/13×1/16)×3
3个回答
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