1.125+2.125+3.125+.80.125等于多少?
问题描述:
1.125+2.125+3.125+.80.125等于多少?
答
1.125+2.125+3.125+......80.125
=1+0.125+2+0.125+3+0.125+。。。。。。+80+0.125
=0.125×(1+2+3.。。。。+80)
=0.125×(81×40)
=0.125×3240
=405
这是我在静心思考后得出的结论,
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答
=(1+2+3+...+80)+(1/8+1/8+...+1/8) 80个1/8
=(1+80)×80÷2+10
=3250