SAT数学题啊各种求解释和解答
3,8,18……
Inthesequenceabove,thefirsttermis3andeachtermafterthefirsttermistwicethesumoftheprecedingtermand1.Forexample,8=2(3+1).Whatisthevalueofthefirsttermofsequencethatisgreaterthan100?
Togetthemostbenefitfromexercise,itisrecommendedthatapersonattainaheartrate,measuredinbeatsperminute,thatisbetween60percentand75percentofthevalueobtainedbysubtractingtheperson'sagefrom220.Whatisonepossibleheartrate,inbeatsperminute,recommendedfora20-year-oldjogger?
Whenacertaintwo-digitnumberismultipliedbyacertainone-digitnumber,theproductis891.Iftheone-digitnumberissubtractedfromtwo-digitnumber,whatistheresult?
a<b<c<d<e
p=abcde
Intheinequalityandtheequationabove,a,b,c,d,andearepositiveintegers.Whenjustoneoftheseintegersisincreasedby1andmultipliedbytheotherfour,thenewproductisn.Thedifference(n-p)is greatestwhenwhichofthefiveintegersisincreasedby1?
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