
用递等式计算.(能简便的要简便算)72÷79÷114; 50×551+551; &nb...
用递等式计算.(能简便的要简便算)72÷79÷114;50×551+551;78×379;(27+15)×7×5....
用递等式计算.(能简便的要简便算)72÷79÷114; 50×551+551; 78×379; (27+15)×7×5.
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①
÷
÷1
=
×
×
=
②50×
+
=
×(50+1)
=5
③78×
;
=(79-1)×
=79×
-
=2
④(
+
)×7×5
=
×7×5+
×7×5
=10+7
=17
7 |
2 |
7 |
9 |
1 |
4 |
=
7 |
2 |
9 |
7 |
4 |
5 |
=
18 |
5 |
②50×
5 |
51 |
5 |
51 |
=
5 |
51 |
=5
③78×
3 |
79 |
=(79-1)×
3 |
79 |
=79×
3 |
79 |
3 |
79 |
=2
76 |
79 |
④(
2 |
7 |
1 |
5 |
=
2 |
7 |
1 |
5 |
=10+7
=17
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