13.若点A(-4,3)、B(m,2)在同一个反比例函数的图象上,则m的值为( )
| A. | 6 | B. | -6 | C. | 12 | D. | -12 |
12.云南高铁自开通以来,发展速度不断加快,现已成为云南市民主要出行方式之一.今年五一期间安全运输乘客约5460000人次.用科学记数法表示5460000为( )
| A. | 5.46×107 | B. | 5.46×106 | C. | 5.5×106 | D. | 546×104 |
10.下列运算正确的是( )
0 294384 294392 294398 294402 294408 294410 294414 294420 294422 294428 294434 294438 294440 294444 294450 294452 294458 294462 294464 294468 294470 294474 294476 294478 294479 294480 294482 294483 294484 294486 294488 294492 294494 294498 294500 294504 294510 294512 294518 294522 294524 294528 294534 294540 294542 294548 294552 294554 294560 294564 294570 294578 366461
| A. | a2+a2=a4 | B. | (a+b)2=a2+b2 | C. | $\sqrt{9}$=±3 | D. | (-a2)3=-a6 |