题目内容
列竖式计算(带☆号的要验算)
☆407-278= | 198+619= | ☆705+196= | 800-66= |
435+247= | 504-235= | 99+703= | ☆811-139= |
分析:①④⑥⑧按照整数减法法则计算,再运用加法或减法验算①⑧;
②③⑤⑦按照整数加法法则计算,再运用加法或减法验算③.
②③⑤⑦按照整数加法法则计算,再运用加法或减法验算③.
解答:解:①407-278=129;
验算:
;
②198+619=817;
;
③705+196=901;
;
④800-66=734;
;
⑤435+247=682;
;
⑥504-235=269;
;
⑦99+703=802;
;
⑧811-139=672;
.
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/9df3af97.png)
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/49f5a002.png)
②198+619=817;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/2cb1e291.png)
③705+196=901;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/d25bcde7.png)
④800-66=734;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/7cbabaea.png)
⑤435+247=682;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/e97f11aa.png)
⑥504-235=269;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/8f2474af.png)
⑦99+703=802;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/7091dd8e.png)
⑧811-139=672;
![](http://thumb.1010pic.com/pic3/upload/images/201211/75/03912982.png)
点评:在列竖式计算时要注意先对齐相同数位,再计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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