灵活计算.78×1213+78÷1314÷(3-715-815)72×(13-14-136)(512+119)×12+719(34-34×25)÷15121×117×(2009×42×85)-数学

题目简介

灵活计算.78×1213+78÷1314÷(3-715-815)72×(13-14-136)(512+119)×12+719(34-34×25)÷15121×117×(2009×42×85)-数学

题目详情

灵活计算.
7
8
×
12
13
+
7
8
÷13
1
4
÷(3-
7
15
-
8
15
72×(
1
3
-
1
4
-
1
36
5
12
+
1
19
)×12+
7
19
3
4
-
3
4
×
2
5
)÷
1
5
1
21
×
1
17
×(2009×42×85)
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
8
×class="stub"12
13
+class="stub"7
8
÷
13,
=class="stub"7
8
×class="stub"12
13
+class="stub"7
8
×class="stub"1
13

=class="stub"7
8
×(class="stub"12
13
+class="stub"1
13
),
=class="stub"7
8
×1,
=class="stub"7
8


(2)class="stub"1
4
÷(3-class="stub"7
15
-class="stub"8
15
),
=class="stub"1
4
÷[3-(class="stub"7
15
+class="stub"8
15
)],
=class="stub"1
4
÷[3-1],
=class="stub"1
4
÷
2,
=class="stub"1
8


(3)72×(class="stub"1
3
-class="stub"1
4
-class="stub"1
36
),
=72×class="stub"1
3
-72×class="stub"1
4
-72×class="stub"1
36

=24-18-2,
=4;

(4)(class="stub"5
12
+class="stub"1
19
)×12+class="stub"7
19

=class="stub"5
12
×12+class="stub"1
19
×12+class="stub"7
19

=5+(class="stub"12
19
+class="stub"7
19
),
=6;

(5)(class="stub"3
4
-class="stub"3
4
×class="stub"2
5
)÷class="stub"1
5

=[class="stub"3
4
×(1-class="stub"2
5
)]×5,
=[class="stub"3
4
×class="stub"3
5
]×5,
=class="stub"9
20
×5,
=class="stub"9
4


(6)class="stub"1
21
×class="stub"1
17
×(2009×42×85),
=(class="stub"1
21
×
42)×(class="stub"1
17
×85)×2009,
=2×5×2009,
=20090;

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