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数学
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(1-3+5-7+9-11.+97-99)怎么做
人气:347 ℃ 时间:2020-01-26 03:18:05
解答
把每两项看成一个整体,原式=(1-3)+(5-7)+(9-11)+.(97-99)=-2-2-2-.-2=-2*25=-50
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(1-3+5-7+9-11.+97-99)怎么做
1/1×3+1/3×5+1/5×7+1/7×9……1/97×99
1+-3+5+-7+9+-11+……+97+-99等于多少?
1+3+5+7+9+...+97+99=多少
计算1-3+5-7+9-11+…+97-99.
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