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(1/5+1/10)×(4-1/3) =3/10×11/3 =1又1/10 (4/5-2/3)÷2/7 =2/15×7/2 =7/15 答:這個數是7/15
任何數和它的倒數的積都是1,1-a=1/3,a = 2/3
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