题目内容

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
].
(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.
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