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20L~z߅L(sh)L@ӵLβֻһNeСģL____________;eL____________
cLεL͌20÷2=10()tLεe=L×,9×1=98×2=167×3=216×4=245×5=25
eС.L9,1;eL55ס
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Ҷ˷քeABɵͬrl(f)ͬ26s;У6犿֪ÿ50ABɵصľx
cO(sh)ٶx/犣ô(x-50)*26=(x+50)*6
x=80ԃɵؾx(80+50)*6=780
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꼉ĊW(sh)}(sh)}10-25
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꼉ĊW(sh)}(sh)ֆ}10-13
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