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1.(★☆☆☆☆)圈一圈,算一算。
$14 - 4 =
$17 - 9 =
$14 - 4 =
10
$$17 - 9 =
8
$
答案：
$10$；$8$
$\begin{array}{|c|}\hline 32 \\ \hline 43 \\ \hline 24 \\ \hline 62 \\ \hline \end{array}+5= \begin{array}{|c|}\hline
$\begin{array}{|c|}\hline 46 \\ \hline 38 \\ \hline 57 \\ \hline 29 \\ \hline \end{array}+30= \begin{array}{|c|}\hline
37
\\ \hline 48
\\ \hline 29
\\ \hline 67
\\ \hline \end{array}$$\begin{array}{|c|}\hline 46 \\ \hline 38 \\ \hline 57 \\ \hline 29 \\ \hline \end{array}+30= \begin{array}{|c|}\hline
76
\\ \hline 68
\\ \hline 87
\\ \hline 59
\\ \hline \end{array}$
答案：
$\begin{array}{|c|}\hline 32 \\ \hline 43 \\ \hline 24 \\ \hline 62 \\ \hline \end{array}+5= \begin{array}{|c|}\hline 37 \\ \hline 48 \\ \hline 29 \\ \hline 67 \\ \hline \end{array}$
$\begin{array}{|c|}\hline 46 \\ \hline 38 \\ \hline 57 \\ \hline 29 \\ \hline \end{array}+30= \begin{array}{|c|}\hline 76 \\ \hline 68 \\ \hline 87 \\ \hline 59 \\ \hline \end{array}$
$\begin{array}{|c|}\hline 46 \\ \hline 38 \\ \hline 57 \\ \hline 29 \\ \hline \end{array}+30= \begin{array}{|c|}\hline 76 \\ \hline 68 \\ \hline 87 \\ \hline 59 \\ \hline \end{array}$
31
$\xrightarrow{+20}$51
$\xrightarrow{+3}$54
$\xrightarrow{+4}$58
$\xrightarrow{+20}$78
$\xrightarrow{+10}$88
40
$\xrightarrow{+3}$43
$\xrightarrow{+4}$47
$\xrightarrow{+20}$67
$\xrightarrow{+2}$69
$\xrightarrow{+30}$99
答案：
第一行：$31$，$51$，$54$，$58$，$78$，$88$
第二行：$40$，$43$，$47$，$67$，$69$，$99$
第二行：$40$，$43$，$47$，$67$，$69$，$99$
4.(★★☆☆☆)算一算,填一填。
$8 + (
$6 + (
$9 + (
$7 + (
$(
$5 + (
$8 + (
4
) = 12$$6 + (
8
) = 14$$9 + (
6
) = 15$$7 + (
6
) = 13$$(
6
) + 6 = 12$$5 + (
6
) = 11$
答案：
$4$；$8$；$6$；$6$；$6$；$6$
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