(1+x/100)(1-x/200)=1.125
1-x/200+x/100-x2乗/20000=1.125
20000-100x+200x-x2乗=1.125×20000
20000+100x-x2乗=22500
100x-x2乗=22500-20000
x2乗-100x=-2500
x2乗-100x+2500=0
(x-50)2乗=0
x=50
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