怎样简便怎样算.712+35+512=13+38+23+58=59-(29+16)=-数学

题目简介

怎样简便怎样算.712+35+512=13+38+23+58=59-(29+16)=-数学

题目详情

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

答案

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

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

=1+class="stub"3
5

=1class="stub"3
5


(2)class="stub"1
3
+class="stub"3
8
+class="stub"2
3
+class="stub"5
8

=(class="stub"1
3
+class="stub"2
3
)+(class="stub"3
8
+class="stub"5
8
),
=1+1,
=2.

(3)class="stub"5
9
-(class="stub"2
9
+class="stub"1
6

=class="stub"5
9
-class="stub"2
9
-class="stub"1
6

=class="stub"1
3
-class="stub"1
6

=class="stub"1
6

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