16.下面图形是用木条钉成的支架,其中不容易变形的是( )
| A. | B. | C. | D. |
15.与分式$\frac{-a+b}{-a-b}$相等的是( )
| A. | $\frac{a-b}{a+b}$ | B. | $-\frac{a+b}{a-b}$ | C. | $\frac{a+b}{a-b}$ | D. | $-\frac{a-b}{a+b}$ |
14.下列变形中,正确的是( )
| A. | 由5x=-4得x=-$\frac{5}{4}$ | B. | 由4x+2=3x-1得4x+3x=2-1 | ||
| C. | 由$\frac{x}{5}$-1=2得x-5=2 | D. | 由4x-3=2x-2得2x=1 |
12.下列变形中错误的是( )
| A. | m2-(2m-n-p)=m2-2m+n+p | B. | m-n+p-q=m-(n+q-p) | ||
| C. | 3m-5n-1+2p=-(-3m)-[5n-(2p-1)] | D. | m+1-(-n+p)=-(-1+n-m+p) |
10.若2x=4y+1,27y=3x+1,则x-y等于( )
| A. | 5 | B. | -3 | C. | -1 | D. | 1 |
7.平面中2条不重合的直线至多可以将平面划分成4个区域,那么4条不重合的直线至多可以将平面划分成( )
0 294998 295006 295012 295016 295022 295024 295028 295034 295036 295042 295048 295052 295054 295058 295064 295066 295072 295076 295078 295082 295084 295088 295090 295092 295093 295094 295096 295097 295098 295100 295102 295106 295108 295112 295114 295118 295124 295126 295132 295136 295138 295142 295148 295154 295156 295162 295166 295168 295174 295178 295184 295192 366461
| A. | 8 | B. | 9 | C. | 10 | D. | 11 |