问题 解答题
脱式计算.
①231-152÷49
1
3
÷[(
2
3
+
1
5
)×
1
13
]
③5+0.45÷0.9-1.75
④1110÷(56×(
3
7
-
3
8
))
答案

①231-152÷49

=231-3

5
49

=227

44
49

1
3
÷[(
2
3
+
1
5
)×
1
13
]

=

1
3
÷[
13
15
×
1
13
],

=

1
3
×15,

=5;

③5+0.45÷0.9-1.75

=5+0.5-1.75,

=3.75;

④1110÷[56×(

3
7
-
3
8
)]

=1110÷[56×

3
7
-56×
3
8
],

=1110÷[24-21],

=1110÷3,

=370.

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