3和4题~

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3和4题~
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3和4题~
3和4题~

3和4题~
3.当a=2时
原式=2√2-(√2+2)/(2-√2)
=2√2-(√2+2)(2+√2)/(2-√2)(2-√2)
=2√2-(2+4√2+4)/(4-2)
=2√2-(6+4√2)/2
=2√2-3-2√2
=-3
so,选C.
4.原方程可化为
3√2x+√2x+√2x=10
5√2x=10
√2x=2
(√2x)^2=2^2
2x=4
x=2
so,选C咧~
我过程写的还算详细吧0.0 同志仍需努力啊= =.
PS:图也够模糊的了= =.下次再问题最好用像素高点的活着在亮处,否则看不清题哇~