四、用竖式计算，带$*$的要验算。
$287+75$         $612-326$         $*368+435$
$747-558$         $447+368$         $*802-634$
$614-297$         $374+268$         $365-86$
$306+98-261$         $245+147+86$         $800-533+355$
$700-219-321$         $483+376-557$         $73+349+328$

1. $287 + 75 = 362$
2. $612 - 326 = 286$
3. $368 + 435 = 803$
验算：$803 - 435 = 368$
4. $747 - 558 = 189$
5. $447 + 368 = 815$
6. $802 - 634 = 168$
验算：$168 + 634 = 802$
7. $614 - 297 = 317$
8. $374 + 268 = 642$
9. $365 - 86 = 279$
10. $306 + 98 - 261 = 143$
11. $245 + 147 + 86 = 478$
12. $800 - 533 + 355 = 622$
13. $700 - 219 - 321 = 160$
14. $483 + 376 - 557 = 302$
15. $73 + 349 + 328 = 750$