下面各题,怎样算简便就怎样算(1)1516-(712+16)×12(2)(1-75%)÷(1+14)(3)517×924+717×924(4)(25-25÷2)×53(5)59÷[1÷(110-9%)

题目简介

下面各题,怎样算简便就怎样算(1)1516-(712+16)×12(2)(1-75%)÷(1+14)(3)517×924+717×924(4)(25-25÷2)×53(5)59÷[1÷(110-9%)

题目详情

下面各题,怎样算简便就怎样算
(1)
15
16
-(
7
12
+
1
6
)×
1
2
(2)(1-75%)÷(1+
1
4
(3)
5
17
×
9
24
+
7
17
×
9
24
(4)(
2
5
-
2
5
÷2)×
5
3
(5)59÷[1÷(
1
10
-9%)]
(6)
1
5
×79+21×0.2
题型:解答题难度:中档来源:不详

答案

(1)class="stub"15
16
-(class="stub"7
12
+class="stub"1
6
)×class="stub"1
2

=class="stub"15
16
-class="stub"3
4
×class="stub"1
2

=class="stub"15
16
-class="stub"3
8

=class="stub"9
16


(2)(1-75%)÷(1+class="stub"1
4
),
=class="stub"1
4
÷class="stub"5
4

=class="stub"1
5


(3)class="stub"5
17
×class="stub"9
24
+class="stub"7
17
×class="stub"9
24

=(class="stub"5
17
+class="stub"7
17
)×class="stub"9
24

=class="stub"12
17
×class="stub"9
24

class="stub"9
34


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

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

=class="stub"1
5
×class="stub"5
3

=class="stub"1
3


(5)59÷[1÷(class="stub"1
10
-9%)],
=59÷[1÷0.01],
=59÷100,
=0.59;

(6))class="stub"1
5
×79+21×0.2

=(79+21)×0.2,
=100×0.2,
=20.

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