S 1.1 Preliminaries for CalculusI. The Integers and the Rational Numbers（四则运算）2. The Four Arithmetic Operations（加减乘除）addsubtractdividemultiply（和差积商）differenceproductquotientsum
2. The Four Arithmetic Operations （四则运算） add sum subtract difference multiply divide product quotient （加减乘除） （和差积商） I. The Integers and the Rational Numbers §1.1 Preliminaries for Calculus
S 1.1 Preliminaries for CalculusI. Inequalities(区间)1. Intervals(xa<x<b)=(a,b) Open Intervalb0ax[xa ≤ x ≤b] =[a,b] Closed Intervalxb0a(x|a<x≤b)=(a,b]bxa0(xx<b) =(-00,b)bx0(x|x ≥a} =[a,+)InfiniteIntervalx0aR=(-00,+0)
II. Inequalities {x a x b}= (a,b) Open Interval o a b x {x a x b}= [a,b] o a b x {x a x b}= (a,b] o a b x Closed Interval {x x b}= (−,b) o b x {x x a}=[a,+) o a x R = (−,+) x Infinite Interval 1. Intervals （区间） §1.1 Preliminaries for Calculus