2018_2019学年七年级数学上册第二章有理数及其运算2.11有理数的混合运算课件(新版)北师大版.ppt

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11 有理数的混合运算,有理数的混合运算的顺序是:先算 ,再算 ,最后算 ;如果有括号,先算 里面的.,乘方,乘除,加减,括号,1,2,3,4,答案,1.(2017河北中考)下列运算结果为正数的是( ). A.(-3)2 B.-32 C.0(-2 017) D.2-3,5,1,2,3,4,答案,5,1,2,3,4,答案,3.(2017江苏南京中考)计算12+(-18)(-6)-(-3)2的结果是( ). A.7 B.8 C.21 D.36,5,1,2,3,4,4.计算:23-(-2)= .,答案,5,1,2,3,4,5,答案,

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