2.
关于x的不等式x-a≥-2的解集如图所示,则a的值等于( )
| A. | 0 | B. | 1 | C. | -1 | D. | -2 |
1.如果方程$\left\{\begin{array}{l}{x=y+5}\\{2x-y=5}\end{array}\right.$的解满足方程x+y+a=0,那么a的值是( )
| A. | -5 | B. | 5 | C. | -3 | D. | 3 |
20.若(x-y+3)2+|2x+y|=0,则xy的值为( )
| A. | 1 | B. | 2 | C. | -1 | D. | -2 |
19.若关于x、y的方程ax-2y=-4有一组解$\left\{\begin{array}{l}{x=2}\\{y=-3}\end{array}\right.$,则a的值为( )
| A. | -8 | B. | 6 | C. | -5 | D. | 7 |
18.已知实数a、b,若a>b,则下列结论正确的是( )
| A. | a-5=b-5 | B. | -2a>-2b | C. | $\frac{a}{3}$>$\frac{b}{3}$ | D. | 2a>3b |
17.已知关于x的方程2(x+m)-4=0的解是x=2,则m的值为( )
| A. | 1 | B. | 0 | C. | -1 | D. | -$\frac{1}{3}$ |
16.若代数式3x-4与-2x+1的值相等,则x的值是( )
0 297283 297291 297297 297301 297307 297309 297313 297319 297321 297327 297333 297337 297339 297343 297349 297351 297357 297361 297363 297367 297369 297373 297375 297377 297378 297379 297381 297382 297383 297385 297387 297391 297393 297397 297399 297403 297409 297411 297417 297421 297423 297427 297433 297439 297441 297447 297451 297453 297459 297463 297469 297477 366461
| A. | 1 | B. | 2 | C. | 3 | D. | 5 |