GMAT数学(博智教材)第62页:If X is equal to the sum of the even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of x+y?
X=40+42+44......60=550
Y=(60-40)/2+1=11, 答案应该是561,为什么书后面的答案显示是560?
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为什么critique和envisioning不算并列?划线部分做同位语作用,为何不能用起伴随作用的DE?as well as是否既可以用在两者比较又可以用在三者?