阅读下列材料,并回答问题:∵11×2=1-12,12×3=12-13,13×4=13-14,14×5=14-15,…∵11×3=12(1-13),13×5=12(13-15),15×7=12(15-17),…(1)从计算结果中找出规律,利用规律性计算-数学
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=1-
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=
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(2)
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1×3 |
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3×5 |
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5×7 |
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99×101 |
=
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