计算下面各题,能简算的要用简便方法计算.2008-900÷15×120.5×(1.6+4.2÷0.3)35+411+25+711(34-34×56)÷98512÷[38×(79-12)]45×(89+

题目简介

计算下面各题,能简算的要用简便方法计算.2008-900÷15×120.5×(1.6+4.2÷0.3)35+411+25+711(34-34×56)÷98512÷[38×(79-12)]45×(89+

题目详情

计算下面各题,能简算的要用简便方法计算.
2008-900÷15×12
0.5×(1.6+4.2÷0.3)
3
5
+
4
11
+
2
5
+
7
11

3
4
-
3
4
×
5
6
)÷
9
8

5
12
÷[
3
8
×(
7
9
-
1
2
)]
45×(
8
9
+
2
15
-
3
5
题型:解答题难度:中档来源:不详

答案

(1)2008-900÷15×12
=2008-60×12,
=2008-720,
=1288;
(2)0.5×(1.6+4.2÷0.3)
=0.5×(1.6+14),
=0.5×15.6,
=7.8;
(3)class="stub"3
5
+class="stub"4
11
+class="stub"2
5
+class="stub"7
11

=(class="stub"3
5
+class="stub"2
5
)+(class="stub"4
11
+class="stub"7
11
),
=1+1,
=2;
(4)(class="stub"3
4
-class="stub"3
4
×class="stub"5
6
)÷class="stub"9
8

=[(1-class="stub"5
6
)×class="stub"3
4
)]÷class="stub"9
8

=[class="stub"1
6
×class="stub"3
4
class="stub"8
9

=class="stub"1
8
×class="stub"8
9

=class="stub"1
9

(5)class="stub"5
12
÷[class="stub"3
8
×(class="stub"7
9
-class="stub"1
2
)]
=class="stub"5
12
÷[class="stub"3
8
×class="stub"5
18
],
=class="stub"5
12
×
class="stub"48
5

=4;
(6)45×(class="stub"8
9
+class="stub"2
15
-class="stub"3
5

=45×class="stub"8
9
+45×class="stub"2
15
-45×class="stub"3
5

=40+6-27,
=19.

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