问题 解答题
计算.
(1)(
1
5
+
2
7
)×5×7

(2)
19
91
×97-6×
19
97

(3)(1.6÷0.32)÷(3.5-2.25)
(4)
5
4
×[(
1
5
+
1
3
3
2
]
答案

(1)(

1
5
+
2
7
)×5×7,

=

17
35
×5×7,

=

17
7
×7,

=17;

(2)

19
91
×97-6×
19
97

=

1843
91
-
114
97

=20

1857
8827

(3)(1.6÷0.32)÷(3.5-2.25),

=5÷1.25,

=4;

(4)

5
4
×[(
1
5
+
1
3
)×
3
2
],

=

5
4
×[
8
15
×
3
2
],

=

5
4
×
4
5

=1.

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