124.68 324.68 524.68 724.68 924.68怎样计算？上式各项成等差数列首项为124.68，公差为200根据等差数列求和公式则有124.68 324.68 524.68 724
124.68 324.68 524.68 724.68 924.68怎样计算？
上式各项成等差数列首项为124.68，公差为200根据等差数列求和公式则有124.68 324.68 524.68 724.68 924.68=#28124.68 924.68#29#2A5/2=524.68#2A2#2A5/2=5246.8/2=2623.4124.68 324.68 524.68 724.28 924.68的简便运算？
124.68 324.68 524.68 724.28 924.68=100 300 500 700 900 24.68#2A5
=2500 123.4
=2623.4
124.68 324.68 524.68 724.68 924.68=? 等差数数列求和？
上式各项成等差数列首项为124.68，公(拼音：gōng)差为200
澳门新葡京根【练：gēn】据等差数列求和公式则有
=2623.4
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