9.口算
| 15÷0.3= | 0.05×0.9= | 2.72-2.72×0.5= |
| 0.5÷0.5×0.1= | 3.8a+1.2a= | 1.2×0.4+1.3×0.4= |
7.7.2÷0.55,当商是13时,余数是( )
| A. | 5 | B. | 0.5 | C. | 0.05 |
6.与6.45×0.28的结果相等的算式有( )
| A. | 0.645×2.8 | B. | 64.5×2.8 | C. | 645×0.028 | D. | 0.0645×28 |
4.用放大2倍的放大镜看30°的角,看到的度数是( )
| A. | 30° | B. | 60° | C. | 15° |
3.把一根细线拉直就是一条( )
0 127793 127801 127807 127811 127817 127819 127823 127829 127831 127837 127843 127847 127849 127853 127859 127861 127867 127871 127873 127877 127879 127883 127885 127887 127888 127889 127891 127892 127893 127895 127897 127901 127903 127907 127909 127913 127919 127921 127927 127931 127933 127937 127943 127949 127951 127957 127961 127963 127969 127973 127979 127987 199269
| A. | 射线 | B. | 直线 | C. | 线段 |