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2个回答
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100×(35×30-20×15)²/(55×45×50×50)
=(100/50)×【15×(35×2-20)】²/(55×45×50)
=2×225×50²/(55×45×50)
=2×50×(50/50)×(225/45)/55
=100×5/55
=100/11
=(100/50)×【15×(35×2-20)】²/(55×45×50)
=2×225×50²/(55×45×50)
=2×50×(50/50)×(225/45)/55
=100×5/55
=100/11
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