> 数学 >
怎样简便就怎样算.
7
18
×37-
7
18

11
13
×37+73×
11
13
-19×
11
13

24×
51
43
+51×
19
43

69×
13
54
-13×
15
54
人气:421 ℃ 时间:2019-10-23 07:24:06
解答
(1)
7
18
×37-
7
18

=
7
18
×(37-1),
=
7
18
×36,
=14;
(2)
11
13
×37+73×
11
13
-19×
11
13

=
11
13
×(37+73-19),
=
11
13
×91,
=77;
(3)24×
51
43
+51×
19
43

=24×
51
43
+
51
43
×19,
=(24+19)×
51
43

=43×
51
43

=51;
(4)69×
13
54
-13×
15
54

=23×
13
18
-5×
13
18

=(23-5)×
13
18

=18×
13
18

=13.
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