2x/(1+2*(x-1))*(2x+1)
2/1×3,4/3×5,6/5×7,8/7×9的通项公式
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相关问题
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计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
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计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
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计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
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计算:1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9=______.
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如何计算下题: 1×2×3+2×3×4+3×4×5+4×5×6+5×6×7+6×7×8+7×8×9+……+n×(n+1)
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算一算.7×2-2= 4×9+9= 3×8-3= 3×6+3= 7×4+4= 4×9-9= 5×8+8= 6×3-6=
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1+2+3+4+5+6+7+8+9+10×1×2×3×4×5×67×8×9×10=
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1+2×3+3×4+5×6+7×8+9×10
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简便计算. 4 5 × 3 8 + 4 5 × 1 2 (3× 5 12 )×4 3 7 × 2 9 × 7 8 4 9
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2/3×6×3/8,3/10×4/7×7/9,4/5×4/7×5/12,等于多少?