郑州万科美景龙堂贵吗:1111111……(20个1)怎样用加减乘除才能使得数是520
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[(1+1)×(1+1)×(1+1)×(1+1)×(1+1)×(1+1)+1]×(1+1)×(1+1)×(1+1)×1=520
[(1+1+1)*(1+1+1)+1]*(1+1)*(1+1)*[(1+1)*(1+1)*(1+1+1)*1+1]=520
[(1+1)×(1+1)×(1+1)×(1+1)×(1+1)×(1+1)+1]×(1+1)×(1+1)×(1+1)×1=520
[(1+1+1)*(1+1+1)+1]*(1+1)*(1+1)*[(1+1)*(1+1)*(1+1+1)*1+1]=520