第二题计算的234三个小题,
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第二题计算的234三个小题,
![](http://img.wesiedu.com/upload/a/c0/ac03dd91a25015b7341ee4f615913eba.jpg)
![](http://img.wesiedu.com/upload/a/c0/ac03dd91a25015b7341ee4f615913eba.jpg)
![第二题计算的234三个小题,](/uploads/image/z/19194221-29-1.jpg?t=%E7%AC%AC%E4%BA%8C%E9%A2%98%E8%AE%A1%E7%AE%97%E7%9A%84234%E4%B8%89%E4%B8%AA%E5%B0%8F%E9%A2%98%2C)
(2)原式=√(2×7)*√2/√7
=√2×√7*√2/√7
=2
(3)原式=√20/2÷√5/3
=√(2×2×5)*3/√5
=2√5/2*3√5/5
=15/5
=3
(4)原式=-7*√(2×4)÷√2/√2×√2
=-14√2×2/√2
=-28
=√2×√7*√2/√7
=2
(3)原式=√20/2÷√5/3
=√(2×2×5)*3/√5
=2√5/2*3√5/5
=15/5
=3
(4)原式=-7*√(2×4)÷√2/√2×√2
=-14√2×2/√2
=-28