题目内容

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
].
(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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