7.已知一个正比例函数的图象经过A(-2,m)和(n,3)两点,则m,n间的关系一定是( )
| A. | mn=-6 | B. | m=-$\frac{3}{2}$n | C. | m=-$\frac{2}{3}$n | D. | mn=6 |
6.
如图,下列等式不一定成立的是( )
| A. | AC-BC=BD-BC | B. | AD-CD=AB+BC | C. | AC-BC=AD-BD | D. | AD-AC=BD-BC |
5.如果$\frac{a}{b}$=$\frac{3}{2}$,那么$\frac{a}{a+b}$等于( )
| A. | $\frac{2}{3}$ | B. | $\frac{2}{5}$ | C. | $\frac{3}{5}$ | D. | $\frac{5}{3}$ |
2.某市地图上有一块草地,三边长分别为3cm、4cm、5cm,已知这块草地最短边的实际长度为90m,则这块草地的实际面积是( )
0 285972 285980 285986 285990 285996 285998 286002 286008 286010 286016 286022 286026 286028 286032 286038 286040 286046 286050 286052 286056 286058 286062 286064 286066 286067 286068 286070 286071 286072 286074 286076 286080 286082 286086 286088 286092 286098 286100 286106 286110 286112 286116 286122 286128 286130 286136 286140 286142 286148 286152 286158 286166 366461
| A. | 60m2 | B. | 120m2 | C. | 180m2 | D. | 5400m2 |