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(1x5十2x5十3x5十4x5十5x5…十20x5)x5
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(1x5十2x5十3x5十4x5十5x5…十20x5)x5
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答案和解析
(1x5十2x5十3x5十4x5十5x5…十20x5)x5
=(1+2+3+4+5+...+20)×5×5
=(1+20)×10×25
=21×250
=5250
=(1+2+3+4+5+...+20)×5×5
=(1+20)×10×25
=21×250
=5250
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