14．直接写出得数
| 350÷5= | 21×4= | 86+14= | 45-9= |
| 20×50= | 45÷3= | 30×31= | 70÷5= |
| 150×3= | 50-37+2= | 30×（26-6）= | 34+13×2= |
11．求未知数x．
0 158336 158344 158350 158354 158360 158362 158366 158372 158374 158380 158386 158390 158392 158396 158402 158404 158410 158414 158416 158420 158422 158426 158428 158430 158431 158432 158434 158435 158436 158438 158440 158444 158446 158450 158452 158456 158462 158464 158470 158474 158476 158480 158486 158492 158494 158500 158504 158506 158512 158516 158522 158530 199269
| x×34=2924 | 186×x=2604 | x+73=1280 |
| 8670÷x=15 | x÷28=147 | 7083-x=3465 |