(1)762-357+438-243(2)(34+16-512)÷136(3)(200.6×365+2006×63.5)×40%(4)415×5+3247÷4+0.25×124(5)(0.5+14+3

题目简介

(1)762-357+438-243(2)(34+16-512)÷136(3)(200.6×365+2006×63.5)×40%(4)415×5+3247÷4+0.25×124(5)(0.5+14+3

题目详情

(1)762-357+438-243
(2)(
3
4
+
1
6
-
5
12
÷
1
36

(3)(200.6×365+2006×63.5)×40%
(4)4
1
5
×5+32
4
7
÷4+0.25×124

(5)(0.5+
1
4
+3
1
8
÷1.25)÷(5
1
4
-1.25×1
3
5

(6)
2
3
+
2
15
+
2
35
+…+
2
399
题型:解答题难度:中档来源:不详

答案

(1)762-357+438-243,
=(762+438)-(357+243),
=1200-600,
=600;

(2)(class="stub"3
4
+class="stub"1
6
-class="stub"5
12
÷class="stub"1
36

=(class="stub"3
4
+class="stub"1
6
-class="stub"5
12
)×36,
=class="stub"3
4
×36+class="stub"1
6
×36-class="stub"5
12
×36,
=27+6-15,
=33-15,
=18;

(3)(200.6×365+2006×63.5)×40%,
=(200.6×365+200.6×635)×40%,
=(365+635)×200.6×40%,
=1000×200.6×0.4,
=200600×0.4,
=80240;

(4)4class="stub"1
5
×5+32class="stub"4
7
÷4+0.25×124

=(4+class="stub"1
5
)×5+(32+class="stub"4
7
)×class="stub"1
4
+0.25×4×31,
=4×5+class="stub"1
5
×5+32×class="stub"1
4
+class="stub"4
7
×class="stub"1
4
+1×31,
=20+1+8+class="stub"1
7
+31,
=(20+1+8+31)+class="stub"1
7

=60+class="stub"1
7

=60class="stub"1
7


(5)(0.5+class="stub"1
4
+3class="stub"1
8
÷1.25)÷(5class="stub"1
4
-1.25×1class="stub"3
5
),
=(0.5+class="stub"1
4
+2.5)÷(5class="stub"1
4
-2),
=(0.5+2.5+class="stub"1
4
)÷(5class="stub"1
4
-2),
=(3+class="stub"1
4
)÷3class="stub"1
4

=3class="stub"1
4
÷3class="stub"1
4

=1;

(6)class="stub"2
3
+class="stub"2
15
+class="stub"2
35
+…+class="stub"2
399

=(1-class="stub"1
3
)+(class="stub"1
3
-class="stub"1
5
)+(class="stub"1
5
-class="stub"1
7
)+…+(class="stub"1
19
-class="stub"1
21
),
=1-class="stub"1
3
+class="stub"1
3
-class="stub"1
5
+class="stub"1
5
-class="stub"1
7
+…-class="stub"1
19
+class="stub"1
19
-class="stub"1
21

=1-class="stub"1
21

=class="stub"20
21

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