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八年级数学计算题一般
题目
计算
(1)2713+12(1) \sqrt {27}- \sqrt { \dfrac {1}{3}}+ \sqrt {12}
(2)(3+22)(223)(2)(3+2 \sqrt {2})(2 \sqrt {2}-3)
(3)15+60335(3) \dfrac { \sqrt {15}+ \sqrt {60}}{ \sqrt {3}}-3 \sqrt {5}
(4)22+6×32(83)0(4)| \sqrt {2}-2|+ \dfrac { \sqrt {6}× \sqrt {3}}{ \sqrt {2}}-( \sqrt {8}-3)^{0}
知识点:二次根式的混合运算,零指数幂章节:未标注

答案与解析

答案

解:(1)(1)原式=3333+23=3 \sqrt {3}- \dfrac { \sqrt {3}}{3}+2 \sqrt {3}
=1433= \dfrac {14}{3} \sqrt {3}
(2)(2)原式=89=8-9
=1=-1
(3)(3)原式=153+60335= \sqrt { \dfrac {15}{3}}+ \sqrt { \dfrac {60}{3}}-3 \sqrt {5}
=5+2535= \sqrt {5}+2 \sqrt {5}-3 \sqrt {5}
=0=0
(4)(4)原式=22+6×321=2- \sqrt {2}+ \sqrt { \dfrac {6×3}{2}}-1
=22+31=2- \sqrt {2}+3-1
=42=4- \sqrt {2}

解析

解:(1)(1)原式=3333+23=3 \sqrt {3}- \dfrac { \sqrt {3}}{3}+2 \sqrt {3}
=1433= \dfrac {14}{3} \sqrt {3}
(2)(2)原式=89=8-9
=1=-1
(3)(3)原式=153+60335= \sqrt { \dfrac {15}{3}}+ \sqrt { \dfrac {60}{3}}-3 \sqrt {5}
=5+2535= \sqrt {5}+2 \sqrt {5}-3 \sqrt {5}
=0=0
(4)(4)原式=22+6×321=2- \sqrt {2}+ \sqrt { \dfrac {6×3}{2}}-1
=22+31=2- \sqrt {2}+3-1
=42=4- \sqrt {2}

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