脱式计算(能用简便算法的,要写出简便过程)24×10.5-3549÷39710÷[(35-14)×12]2-58÷2528-310815÷16-715×6.-数学

题目简介

脱式计算(能用简便算法的,要写出简便过程)24×10.5-3549÷39710÷[(35-14)×12]2-58÷2528-310815÷16-715×6.-数学

题目详情

脱式计算(能用简便算法的,要写出简便过程)
24×10.5-3549÷39
7
10
÷[(
3
5
-
1
4
)×12]
2-
5
8
÷
25
28
-
3
10
8
15
÷
1
6
-
7
15
×6.
题型:解答题难度:中档来源:不详

答案

(1)24×10.5-3549÷39,
=24×(10+0.5)-91,
=240+12-91,,
=252-91,
=161;

(2)class="stub"7
10
÷
[(class="stub"3
5
-class="stub"1
4
)×12],
=class="stub"7
10
÷[(class="stub"12
20
-class="stub"5
20
)×12],
=class="stub"7
10
÷[class="stub"7
20
×12],
=class="stub"7
10
÷class="stub"21
5

=class="stub"7
10
×class="stub"5
21

=class="stub"1
6


(3)2-class="stub"5
8
÷class="stub"25
28
-class="stub"3
10

=2-class="stub"5
8
×class="stub"28
25
-class="stub"3
10

=2-class="stub"7
10
-class="stub"3
10

=2-(class="stub"7
10
+class="stub"3
10
),
=2-1,
=1;

(4)class="stub"8
15
÷class="stub"1
6
-class="stub"7
15
×
6,
=class="stub"8
15
×
6-class="stub"7
15
×
6,
=(class="stub"8
15
-class="stub"7
15
)×6,
=class="stub"1
15
×
6,
=class="stub"2
5

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