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x-4分之1=5分之3 x=1/4+3/5 x=17/20 8分之3+X=12分之11 x=11/12-3/8 x=13/24 X-5分之2-7分之2=5分之3 x=3/5+2/5+2/7 x=1又2/7 在右上角點擊【評估】,然後就可以選擇【滿意,問題已經完美解决】了.
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