0.2+0.4+0.6+······+9.8等于多少急

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0.2+0.4+0.6+······+9.8等于多少
急

0.2+0.4+0.6+······+9.8
=(0.2+9.8)+(0.4+9.6)+...+(4.8+5.2)+5.0
=49×5
=245;
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等于 245

0.2+0.4+0.6+······+9.8
=[(2+98)+(4+96)+……+(48+52)]/10+5
=[100*5*4+100*4+50]/10
=[2000+400+50]/10
=245

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