计算下面各题(能用简便方法计算的要用简便方法计算).(1)2-14-13-34(2)0.8+58+0.2(3)15-5÷12-712(4)7.8×1.17-7.8×0.17(5)0.25+1115+3

题目简介

计算下面各题(能用简便方法计算的要用简便方法计算).(1)2-14-13-34(2)0.8+58+0.2(3)15-5÷12-712(4)7.8×1.17-7.8×0.17(5)0.25+1115+3

题目详情

计算下面各题(能用简便方法计算的要用简便方法计算).
(1)2-
1
4
-
1
3
-
3
4

(2)0.8+
5
8
+0.2
(3)15-5÷12-
7
12

(4)7.8×1.17-7.8×0.17
(5)0.25+
11
15
+
3
4
+
4
15

(6)
7
9
+
2
3
-
4
9
题型:解答题难度:中档来源:不详

答案

(1)2-class="stub"1
4
-class="stub"1
3
-class="stub"3
4

=2-(class="stub"1
4
+class="stub"3
4
-class="stub"1
3

=2-1-class="stub"1
3

=1-class="stub"1
3

=class="stub"2
3


(2)0.8+class="stub"5
8
+0.2,
=(0.8+0.2)+class="stub"5
8

=1+class="stub"5
8

=1class="stub"5
8


(3)15-5÷12-class="stub"7
12

=15-class="stub"5
12
-class="stub"7
12

=15-(class="stub"5
12
+class="stub"7
12
),
=15-1,
=14;

(4)7.8×1.17-7.8×0.17,
=7.8×(1.17-0.17),
=7.8×1,
=7.8;

(5)0.25+class="stub"11
15
+class="stub"3
4
+class="stub"4
15

=(class="stub"1
4
+class="stub"3
4
)+(class="stub"11
15
+class="stub"4
15
),
=1+1,
=2;

(6)class="stub"7
9
+class="stub"2
3
-class="stub"4
9

=class="stub"7
9
+class="stub"6
9
-class="stub"4
9

=class="stub"13
9
-class="stub"4
9

=1.

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