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用简便方法计算:26×543+18×543-54385×542.
题目详情
用简便方法计算:
26×
+18×
-
85×
.
26×
+18×
-
85×
.
5 5 43 43
5 5 43 43
85×
.
5 5 43 43
85×
.
5 5 42 42
26×
5 |
43 |
5 |
43 |
5 |
43 |
85×
5 |
42 |
26×
5 |
43 |
5 |
43 |
5 |
43 |
85×
5 |
42 |
5 |
43 |
5 |
43 |
5 |
43 |
85×
5 |
42 |
5 |
43 |
85×
5 |
42 |
5 |
42 |
▼优质解答
答案和解析
(1)26×
+18×
-
,
=
×(26+18-1),
=
×43,
=5;
(2)85×
,
=(84+1)×
,
=84×
+1×
=10+
,
=10
. 26×
5 5 543 43 43+18×
5 5 543 43 43-
,
=
×(26+18-1),
=
×43,
=5;
(2)85×
,
=(84+1)×
,
=84×
+1×
=10+
,
=10
.
5 5 543 43 43,
=
×(26+18-1),
=
×43,
=5;
(2)85×
,
=(84+1)×
,
=84×
+1×
=10+
,
=10
.
5 5 543 43 43×(26+18-1),
=
×43,
=5;
(2)85×
,
=(84+1)×
,
=84×
+1×
=10+
,
=10
.
5 5 543 43 43×43,
=5;
(2)85×
,
=(84+1)×
,
=84×
+1×
=10+
,
=10
. 85×
5 5 542 42 42,
=(84+1)×
,
=84×
+1×
=10+
,
=10
.
5 5 542 42 42,
=84×
+1×
=10+
,
=10
.
5 5 542 42 42+1×
=10+
,
=10
.
5 5 542 42 42
=10+
,
=10
.
5 5 542 42 42,
=10
.
5 5 542 42 42.
5 |
43 |
5 |
43 |
5 |
43 |
=
5 |
43 |
=
5 |
43 |
=5;
(2)85×
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
43 |
5 |
43 |
5 |
43 |
=
5 |
43 |
=
5 |
43 |
=5;
(2)85×
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
43 |
=
5 |
43 |
=
5 |
43 |
=5;
(2)85×
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
43 |
=
5 |
43 |
=5;
(2)85×
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
43 |
=5;
(2)85×
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
42 |
=(84+1)×
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
42 |
=84×
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
42 |
=10+
5 |
42 |
=10
5 |
42 |
5 |
42 |
=10
5 |
42 |
5 |
42 |
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