14.
实数a、b在数轴上的位置如图所示,则化简|a-b|-|a|的结果为( )
| A. | -2a+b | B. | -b | C. | -2a-b | D. | b |
13.若单项式-2x5yzn+1和$\frac{1}{3}$x2m+1yz3是同类项,则m,n的值分别为( )
| A. | 1,2 | B. | 2,2 | C. | 3,3 | D. | 2,1 |
11.下列各数中,最小的数是( )
0 283013 283021 283027 283031 283037 283039 283043 283049 283051 283057 283063 283067 283069 283073 283079 283081 283087 283091 283093 283097 283099 283103 283105 283107 283108 283109 283111 283112 283113 283115 283117 283121 283123 283127 283129 283133 283139 283141 283147 283151 283153 283157 283163 283169 283171 283177 283181 283183 283189 283193 283199 283207 366461
| A. | 5 | B. | -$\sqrt{3}$ | C. | π | D. | -1 |