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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×
5
43
+18×
5
43
-
5
43

85×
5
42

26×
5
43
+18×
5
43
-
5
43

85×
5
42
5
43
554343
5
43
554343
5
43

85×
5
42
5
43
554343
85×
5
42
5
42
554242
▼优质解答
答案和解析
(1)26×
5
43
+18×
5
43
-
5
43

=
5
43
×(26+18-1),
=
5
43
×43,
=5;

(2)85×
5
42

=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
26×
5
43
555434343+18×
5
43
555434343-
5
43

=
5
43
×(26+18-1),
=
5
43
×43,
=5;

(2)85×
5
42

=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
5
43
555434343,
=
5
43
×(26+18-1),
=
5
43
×43,
=5;

(2)85×
5
42

=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
5
43
555434343×(26+18-1),
=
5
43
×43,
=5;

(2)85×
5
42

=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
5
43
555434343×43,
=5;

(2)85×
5
42

=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
85×
5
42
555424242,
=(84+1)×
5
42

=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
5
42
555424242,
=84×
5
42
+1×
5
42

=10+
5
42

=10
5
42
5
42
555424242+1×
5
42

=10+
5
42

=10
5
42
5
42
555424242
=10+
5
42

=10
5
42
5
42
555424242,
=10
5
42
5
42
555424242.