问题 解答题
用第等式计算:
(1)[(20+9.744÷2.4)×0.15-1.63]÷0.25
(2)108÷[(0.68+3.72÷1
3
5
-68%)×
10
13
].
答案

(1)[(20+9.744÷2.4)×0.15-1.63]÷0.25,

=[(20+4.06)×0.15-1.63]÷0.25,

=[24.06×0.15-1.63]÷0.25,

=[3.609-1.63]÷0.25,

=1.979÷0.25,

=7.916;

(2)108÷[(0.68+3.72÷1

3
5
-68%)×
10
13
],

=108÷[(0.68+2.325-68%)×

10
13
],

=108÷[(0.68-68%+2.325)×

10
13
],

=108÷[2

13
40
×
10
13
],

=108÷[(2+

13
40
)×
10
13
],

=108÷[2×

10
13
+
13
40
×
10
13
],

=108÷(

20
13
+
1
4
),

=108÷

93
52

=

1872
31

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