12．直接写出得数．
0 158434 158442 158448 158452 158458 158460 158464 158470 158472 158478 158484 158488 158490 158494 158500 158502 158508 158512 158514 158518 158520 158524 158526 158528 158529 158530 158532 158533 158534 158536 158538 158542 158544 158548 158550 158554 158560 158562 158568 158572 158574 158578 158584 158590 158592 158598 158602 158604 158610 158614 158620 158628 199269
| 25+47= | 270÷30= | 21×30= | 16+4-16+4= |
| 50×600= | 25×8= | 420÷60= | 420÷（7×5）= |
