7.
如图,点D在△ABC边BC的延长线上,BA=BC,DB=DA,若∠BAC=m,∠ADB=n,则m与n之间的关系是( )
| A. | 3m+n=180° | B. | 4m-n=180° | C. | 3m-n=180° | D. | 2m+n=180° |
6.
两个一次函数的图象如图所示,下列方程组的解满足交点P的坐标的是( )
| A. | $\left\{\begin{array}{l}{x-2y=4}\\{2x-y=4}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x+2y=4}\\{2x-y=4}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{x+2y=4}\\{2x+y=4}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x-2y=4}\\{2x+y=4}\end{array}\right.$ |
5.已知$\left\{\begin{array}{l}{x=1}\\{y=-2}\end{array}\right.$是二元一次方程组$\left\{\begin{array}{l}{3x+3y=m-1}\\{nx-y=4}\end{array}\right.$的解,则nm的值为( )
| A. | $\frac{1}{4}$ | B. | -$\frac{1}{4}$ | C. | 4 | D. | -4 |
4.
把含有30°的直角三角板(∠ABC=30°)如图放置,若EF∥MN,∠1=100°,则∠2的度数为( )
| A. | 100° | B. | 120° | C. | 130° | D. | 150° |
3.
如图,利用两个正方形和两个长方形拼成一个大正方形,已知两个正方形的边长分别为3cm和4cm,将一个骰子任意抛向大正方形,落在白色区域的概率是( )
| A. | $\frac{1}{2}$ | B. | $\frac{9}{16}$ | C. | $\frac{24}{49}$ | D. | $\frac{25}{49}$ |
2.
如图,点D,E分别在AB,AC上,AD=AE,BE与CD交于点O,下列条件不能判定△ABE≌△ACD的是( )
0 297040 297048 297054 297058 297064 297066 297070 297076 297078 297084 297090 297094 297096 297100 297106 297108 297114 297118 297120 297124 297126 297130 297132 297134 297135 297136 297138 297139 297140 297142 297144 297148 297150 297154 297156 297160 297166 297168 297174 297178 297180 297184 297190 297196 297198 297204 297208 297210 297216 297220 297226 297234 366461
| A. | ∠B=∠C | B. | BE=CD | C. | AB=AC | D. | ∠CEB=∠BDC |