1.列竖式计算。（带☆的要验算）
• 435−90=
−
• 705−44=
−
• 263−80=
−
• 339−98=
−
• 363−124=
−
• 907−573=
−
• 270−135=
−
• 282−158=
−
• 316−135=
−
• 362−258=
−
• 461−354=
−
• 438−241=
−
• 439−141=
−
• 472−236=
−
• 941−315=
−
• 316−125=
−
☆871−356= 验算：
☆318−265= 验算：

435−90=345
$\begin{array}{r}\dot{4}35\\-\ \ 90\\\hline345\end{array}$
705−44=661
$\begin{array}{r}\dot{7}05\\-\ \ 44\\\hline661\end{array}$
263−80=183
$\begin{array}{r}\dot{2}63\\-\ \ 80\\\hline183\end{array}$
339−98=241
$\begin{array}{r}\dot{3}39\\-\ \ 98\\\hline241\end{array}$
363−124=239
$\begin{array}{r}3\dot{6}3\\-124\\\hline239\end{array}$
907−573=334
$\begin{array}{r}\dot{9}07\\-573\\\hline334\end{array}$
270−135=135
$\begin{array}{r}2\dot{7}0\\-135\\\hline135\end{array}$
282−158=124
$\begin{array}{r}2\dot{8}2\\-158\\\hline124\end{array}$
316−135=181
$\begin{array}{r}\dot{3}16\\-135\\\hline181\end{array}$
362−258=104
$\begin{array}{r}3\dot{6}2\\-258\\\hline104\end{array}$
461−354=107
$\begin{array}{r}4\dot{6}1\\-354\\\hline107\end{array}$
438−241=197
$\begin{array}{r}\dot{4}38\\-241\\\hline197\end{array}$
439−141=298
$\begin{array}{r}\dot{4}39\\-141\\\hline298\end{array}$
472−236=236
$\begin{array}{r}4\dot{7}2\\-236\\\hline236\end{array}$
941−315=626
$\begin{array}{r}9\dot{4}1\\-315\\\hline626\end{array}$
316−125=191
$\begin{array}{r}\dot{3}16\\-125\\\hline191\end{array}$
☆871−356=515 验算：$\begin{array}{r}8\dot{7}1\\-356\\\hline515\end{array}$ $\begin{array}{r}8\dot{7}1\\-515\\\hline356\end{array}$
☆318−265=53 验算：$\begin{array}{r}\dot{3}18\\-265\\\hline53\end{array}$ $\begin{array}{r}\dot{3}18\\-\ \ 53\\\hline265\end{array}$

2.比一比。
994−45○959
514−98○415
514−168○347
519−70○450
933−65○865
822−396○428
793−18○772
734−65○670
823−478○344
705−90○639
723−59○666
542−279○262

994−45＜959
514−98＞415
514−168＜347
519−70＜450
933−65＞865
822−396＜428
793−18＞772
734−65＜670
823−478＞344
705−90＜639
723−59＜666
542−279＞262