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)22-12=3,32-22=5,72-62=13,222-212=43,792-782=157.
(2)
-1 2
=3-1 3
×2=2 3
,1 6
-1 4
=1 7
=7-4 4×7
.3 28
故答案为:212,43,792,157,
,7-4 4×7
.3 28