问题
解答题
先观察,再根据规律,把算式填完整. (1)22-12=3,32-22=5,72-62=13,222-______=______,______-782=______; (2)
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答案
(1)222-212=43,792-782=157;
(2)
-1 4
=1 7
=7-4 4×7
,3 28
-1 5
=1 9
=9-5 5×9
.4 45
故答案为:212,43,792,157,
,3 28
,9-5 5×9
.4 45