15.已知一个等腰三角形中有两条边长分别是3cm和4cm,则该三角形的周长是( )
| A. | 10cm | B. | 11cm | C. | 12cm | D. | 10cm或11cm |
14.若关于x、y的方程mx+ny=6的两个解是$\left\{\begin{array}{l}{x=3}\\{y=2}\end{array}\right.$,$\left\{\begin{array}{l}{x=6}\\{y=6}\end{array}\right.$,则( )
| A. | $\left\{\begin{array}{l}{m=-4}\\{n=-3}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{m=4}\\{n=-3}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{m=4}\\{n=3}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{m=-4}\\{n=3}\end{array}\right.$ |
13.如果a>b,那么下列各式中正确的是( )
| A. | a-5<b-5 | B. | $\frac{a}{3}$<$\frac{b}{3}$ | C. | a+5<b+5 | D. | -3a<-3b |
8.
如图,点E是等腰三角形△ABD底边上的中点,点C是AE延长线上任一点,连接BC、DC,则下列结论中:
①BC=AD;②AC平分∠BCD;③AC=AB;④∠ABC=∠ADC.
一定成立的是( )
①BC=AD;②AC平分∠BCD;③AC=AB;④∠ABC=∠ADC.
一定成立的是( )
| A. | ①③ | B. | ②③ | C. | ②④ | D. | ①② |
6.分式方程$\frac{1}{x-2}$=$\frac{2}{x}$解为( )
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| A. | x=-4 | B. | x=2 | C. | x=-2 | D. | x=4 |