脱式计算.(能简算的要简算)(1)975×0.25+934×76-9.75(2)845÷[7.8+58×(234-1.15)](3)[2-(3.75×.113-225÷0.6)]÷0.2(4)1+21

题目简介

脱式计算.(能简算的要简算)(1)975×0.25+934×76-9.75(2)845÷[7.8+58×(234-1.15)](3)[2-(3.75×.113-225÷0.6)]÷0.2(4)1+21

题目详情

脱式计算.(能简算的要简算)
(1)975×0.25+9
3
4
×76-9.75

(2)
84
5
÷[7.8+
5
8
×(
23
4
-1.15)]

(3)[2-(3.75×.1
1
3
-2
2
5
÷0.6)]÷0.2

(4)1+2
1
6
+3
1
12⋅
+4
1
20
+5
1
30
+6
1
42
+7
1
56
+8
1
72
题型:解答题难度:中档来源:不详

答案

(1)975×0.25+9class="stub"3
4
×76-9.75

=9.75×25+9.75×76-9.75,
=9.75×(25+76-1),
=9.75×100,
=975;
(2)class="stub"84
5
÷[7.8+class="stub"5
8
×(class="stub"23
4
-1.15)]

=class="stub"84
5
÷[7.8+class="stub"5
8
×4.6],
=class="stub"84
5
÷[7.8+2.875],
=class="stub"84
5
÷10.675,
=class="stub"672
427

(3)[2-(3.75×.1class="stub"1
3
-2class="stub"2
5
÷0.6)]÷0.2

=[2-(5-4)]÷0.2,
=[2-1]÷0.2,
=1÷0.2,
=5;
(4)1+2class="stub"1
6
+3class="stub"1
12⋅
+4class="stub"1
20
+5class="stub"1
30
+6class="stub"1
42
+7class="stub"1
56
+8class="stub"1
72

=(1+2+3+4+5+6+7+8)+(class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42
+class="stub"1
56
+class="stub"1
72
),
=36+(class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
4
-class="stub"1
5
+class="stub"1
5
-class="stub"1
6
+class="stub"1
6
-class="stub"1
7
+class="stub"1
7
-class="stub"1
8
+class="stub"1
8
-class="stub"1
9
),
=36+(class="stub"1
2
-class="stub"1
9
),
=36+class="stub"7
18

=36class="stub"7
18

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