1. 列竖式计算。
$\begin{array}{r}205\\-106\\\hline\end{array}$ $\begin{array}{r}302\\-193\\\hline\end{array}$ $\begin{array}{r}903\\-555\\\hline\end{array}$ $\begin{array}{r}804\\-349\\\hline\end{array}$
$\begin{array}{r}800\\-524\\\hline\end{array}$ $\begin{array}{r}705\\-296\\\hline\end{array}$ $\begin{array}{r}701\\-233\\\hline\end{array}$ $\begin{array}{r}880\\-239\\\hline\end{array}$
$\begin{array}{r}205\\-106\\\hline\end{array}$ $\begin{array}{r}302\\-193\\\hline\end{array}$ $\begin{array}{r}903\\-555\\\hline\end{array}$ $\begin{array}{r}804\\-349\\\hline\end{array}$
$\begin{array}{r}800\\-524\\\hline\end{array}$ $\begin{array}{r}705\\-296\\\hline\end{array}$ $\begin{array}{r}701\\-233\\\hline\end{array}$ $\begin{array}{r}880\\-239\\\hline\end{array}$
答案:
99 109 348 455 276 409 468 641
2. 找一找,把能组成正确算式的3个数涂上颜色。

答案:
3. 解决问题。
(1)一辆电动车900元,一辆自行车678元。电动车比自行车贵多少元?
(2)新华书店昨天卖出370本书,今天卖出603本书。今天比昨天多卖出多少本书?
(1)一辆电动车900元,一辆自行车678元。电动车比自行车贵多少元?
(2)新华书店昨天卖出370本书,今天卖出603本书。今天比昨天多卖出多少本书?
答案:
(1)900 - 678 = 222(元)
(2)603 - 370 = 233(本)
(1)900 - 678 = 222(元)
(2)603 - 370 = 233(本)
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