=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13
=1/3-1/13
=10/39
1/3×2/5+1/5×2/7+1/7×2/9+1/9×2/11+1/11×2/13 算式
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相关问题
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1/（1×3×5）+1/（3×5×7）+1/（5×7×9）＋1／（7×9×11）＋1／（9×11×13）的简便算法
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已知：2/1×3=1/1-1/3,求①2/1×3+2/3×5+2/5×7+2/7×9+2/9×11的值；
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1.（10.5x11.7x57×85）/（1.7×1.9×3×5×7×9×11×13×15）=?
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1 1 1 1 1 1——＋——＋——＋——＋—— ＋… … ＋—— 1×3 3×5 5×7 7×9 9×11 49×5
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1/2×4+1/3×5+1/4×6+1/5×7+……+1/8×10+1/9×11
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3/5×1/7×6/13+5/7×1/5×2/13-1/13×2/7×1/5
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直接写得数1/2-1/2×1/2=?4/7÷8/11=?9÷1/9=?2/7×3=?12×7/8=?9/25×5/3=?
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1/1×3+1/3×5+1/5×7+1/7×9+1/9×11 简便算法
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1.用简便方法计算1.2/9-7/16×2/9 5/2×4×3/4 1/2×1/15＋1/3×1/2 4/5×7/9×5
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9/11×3/22+1/2×2/11+11/9×8/22 【5/6-4/15+7/10】除以1/30 96/13+6/1