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本学期期中复习时,同学们已经学习了人教版九年级数学上册的五章内容,下面结合2012年中考试题,对重要知识点分七类解析,供参考.一、二次根式的计算问题例1(2012年上海)计算1/2×(3~(1/2)-1)~2+1/(2~(1/2)-1)+3~(1/2)-((2~(1/2)/2)~(-1).解析:此题考查二次根式的乘方、分母有理化、分数指数幂以及负指数幂的运算,注意乘法公式、有
During the semester of this semester, the students had already studied the five chapters of the 9th grade mathematics book of the People’s Education Press. The following questions were combined with the 2012 mid-term exam questions, and seven important points of knowledge were analyzed for reference. Example 1 (2012 Shanghai) calculates 1/2×(3~(1/2)-1)~2+1/(2~(1/2)-1)+3~(1/2)-(( 2~(1/2)/2)~(-1). Analyze: This question examines the operations of quadratic radical power, denominator rationalization, fractional exponentiation, and negative exponentiation. Note the multiplication formula.