1000*1.08*(57+54+51+48+45+42+39+36+33+30+27+24+21+18+15+12+9+6+3)=
2013-10-22
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1000X1.08X(57+54+51+48+.....+12+9+6+3)
=1080X(60X9+30)
=1080X(540+30)
=1080X570
=615600
=1080X(60X9+30)
=1080X(540+30)
=1080X570
=615600
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推荐于2021-01-08
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1000×1.08×(57+54+51+48+45+42+39+36+33+30+27+24+21+18+15+12+9+6+3)
=1000×1.08×[(57+3)+(54+6)+(51+9)+(48+12)+(45+15)+(42+18)+(39+21)+(36+24)+(33+27)+30]
=1000×1.08×[9×60+30]
=1000×1.08×[540+30]
=1000×1.08×570
=615600
=1000×1.08×[(57+3)+(54+6)+(51+9)+(48+12)+(45+15)+(42+18)+(39+21)+(36+24)+(33+27)+30]
=1000×1.08×[9×60+30]
=1000×1.08×[540+30]
=1000×1.08×570
=615600
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