问题 解答题
用你喜欢的方法计算
(1)(
1
15
+
2
17
)×15×17
(2)(1-
17
20
)×
3
8
÷3
(3)25×1.25×32
(4)175×
3
10
+
7
10
×175
(5)187.7×11-187.7(6)19÷[(
3
4
+
1
5
)÷
1
2
].
答案

(1)(

1
15
+
2
17
)×15×17,

=(

1
15
+
2
17
)×(15×17),

=

1
15
×15×17+
2
17
×15×17,

=17+30,

=47.

(2)(1-

17
20
)×
3
8
÷3,

=

3
20
×
3
8
×
1
3

=

3
160

(3)25×1.25×32

=25×1.25×4×8,

=(25×4)×(1.25×8),

=100×10,

=1000;

(4)175×

3
10
+
7
10
×175,

=(

3
10
+
7
10
)×175,

=1×175,

=175;

(5)187.7×11-187.7,

=187.7×(11-1),

=187.7×10,

=1877.

(6)19÷[(

3
4
+
1
5
)÷
1
2
],

=19÷[(

15
20
+
4
20
÷
1
2
],

=19÷[

19
20
×2],

=19÷

19
10

=19×

10
19

=10.

判断题
名词解释