1. $4+7=□$
$11-4=□$
$11-7=□$
$5+8=□$
$13-5=□$
$13-8=□$
$6+8=□$
$14-6=□$
$14-8=□$
$11-4=□$
$11-7=□$
$5+8=□$
$13-5=□$
$13-8=□$
$6+8=□$
$14-6=□$
$14-8=□$
答案
$4+7=11$
$11-4=7$
$11-7=4$
$5+8=13$
$13-5=8$
$13-8=5$
$6+8=14$
$14-6=8$
$14-8=6$
$11-4=7$
$11-7=4$
$5+8=13$
$13-5=8$
$13-8=5$
$6+8=14$
$14-6=8$
$14-8=6$
2. $14-\begin{array}{r} 3\\ 5\\ 7\end{array} =\begin{array}{r} □ \\ □ \\ □ \end{array}$
$12-\begin{array}{r} 9\\ 6\\ 3\end{array} =\begin{array}{r} □ \\ □ \\ □ \end{array}$
$12-\begin{array}{r} 9\\ 6\\ 3\end{array} =\begin{array}{r} □ \\ □ \\ □ \end{array}$
答案
$14-\begin{array}{r} 3\\ 5\\ 7\end{array} =\begin{array}{r} 11 \\ 9 \\ 7\end{array}$
$12-\begin{array}{r} 9\\ 6\\ 3\end{array} =\begin{array}{r} 3 \\ 6 \\ 9\end{array}$
$12-\begin{array}{r} 9\\ 6\\ 3\end{array} =\begin{array}{r} 3 \\ 6 \\ 9\end{array}$
3. 想一想,填一填。




$5+6=\{\begin{array}{l} 3+8\\ □ +□ \\ □ +□ \end{array} $
$6+7=\{\begin{array}{l} □ +□ \\ □ +□ \\ □ +□ \end{array} $
$5+6=\{\begin{array}{l} 3+8\\ □ +□ \\ □ +□ \end{array} $
$6+7=\{\begin{array}{l} □ +□ \\ □ +□ \\ □ +□ \end{array} $
答案
$5+6=\{\begin{array}{l} 3+8\\ 4+7 \\ 2+9 \end{array} $
$6+7=\{\begin{array}{l} 5+8\\ 4+9 \\ 3+10 \end{array} $
(注:答案不唯一,只要每组算式的和与左边算式的和相等即可,如$5+6$还可填$1+10$、$7+4$等;$6+7$还可填$2+11$、$7+6$等)
$6+7=\{\begin{array}{l} 5+8\\ 4+9 \\ 3+10 \end{array} $
(注:答案不唯一,只要每组算式的和与左边算式的和相等即可,如$5+6$还可填$1+10$、$7+4$等;$6+7$还可填$2+11$、$7+6$等)
4.

两次一共飞走了
多少只鸟?
两次一共飞走了
多少只鸟?
答案
$5+7=12$(只)
答:两次一共飞走了12只鸟。
答:两次一共飞走了12只鸟。
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