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156.36+356.36+556.36+756.36+956.36
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156.36+356.36+556.36+756.36+956.36
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156.36+356.36+556.36+756.36+956.36
=56.36×5+(100+300+500+700+900)
=281.8+(100+900)×5/2
=281.8+2500
=2781.8
=56.36×5+(100+300+500+700+900)
=281.8+(100+900)×5/2
=281.8+2500
=2781.8
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