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GRE 数学难题112解答

数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

GRE 数学难题112解答

50。能被九整除的数,其各位和也能被九整除,若由余数,与原数除九余数一致

A/9=X.yu B/9=Y.yu (A-B)=X-Y

50

GRE 数学难题112解答

题不同解法,设a,b ,c ,d ,e 为小于10的正整数,则题中所说五位数与其反数可表示为aX10000+bX1000+cX100+dX10+e

GRE 数学难题112解答

55%的brown hair,同群人中,

GRE 数学难题112解答

80%不是red hair,问the fraction of those who do not have brown hair have red hair??答案是4/9

没brown hair 是1-

GRE 数学难题112解答

55%=45%

有red hair 是1-80%=20%

所以答案是20%/45% = 4/9

acertain money market account that had a balance of $48000 during all of last month earned $360 in interest for the month.at what simple annual interst rate did the account earn interest last month?? 答案是9% 与eX10000+dX1000+cX100+bX10+a,相减得9999a+990b-990d-9999e,不用说就看出来一定可以被

GRE 数学难题112解答

9整除了吧

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