怎样简便就怎样算.(1)3-712-512(2)57×38+58×57(3)18×(49+56)-六年级数学

题目简介

怎样简便就怎样算.(1)3-712-512(2)57×38+58×57(3)18×(49+56)-六年级数学

题目详情

怎样简便就怎样算.
(1)3-
7
12
-
5
12
(2)
5
7
×
3
8
+
5
8
×
5
7
(3)18×(
4
9
+
5
6
题型:解答题难度:中档来源:不详

答案

(1)3-class="stub"7
12
-class="stub"5
12

=3-(class="stub"7
12
+class="stub"5
12

=3-1
=2;

(2)class="stub"5
7
×class="stub"3
8
+class="stub"5
8
×class="stub"5
7

=class="stub"5
7
×(class="stub"3
8
+class="stub"5
8

=class="stub"5
7
×1
=class="stub"5
7


(3)18×(class="stub"4
9
+class="stub"5
6

=18×class="stub"4
9
+18×class="stub"5
6

=8+15
=23.

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