一、数与式(一)实数1.知识框图|a|={a(a>0)0(a=0)-a(a<0)a×10n(0≤|a|<10,n为整数)a0=1,a-F=1/aF(a≠0)2.考点分析(1)有理数①理解有理数的意义,能用数轴上的点表示有理数,会比较有理数的大小.②借助数轴理解相反数和绝对值的意义,会求 1, the number and type (A) of the real number 1. Knowledge block diagram | a | = {a (a> 0) 0 (a = 0) -a (a <0) a × 10n (0≤ | a | <10, n Is an integer) a0 = 1, aF = 1 / aF (a ≠ 0) 2 test points analysis (1) rational number ① understand the meaning of rational numbers can be expressed on the axis points rational numbers, will be more rational number of size. The opposite number and the meaning of absolute value, will seek