问题 解答题
脱式计算(能简算的要简算)
70.9-48.32÷1.6
1
9
-
1
12
)×36
4
25
÷[(
2
5
+
1
3
)×
9
11
]
4
7
×23+16×
1
7
+
1
7
×60.
答案

(1)70.9-48.32÷1.6,

=70.9-30.2,

=40.7;

(2)(

1
9
-
1
12
)×36,

=

1
9
×36-
1
12
×36,

=4-3,

=1;

(3)

4
25
÷[(
2
5
+
1
3
)×
9
11
],

=

4
25
÷[
11
15
×
9
11
],

=

4
25
÷
3
5

=

4
15

(4)

4
7
×23+16×
1
7
+
1
7
×60,

=

1
7
×92+16×
1
7
+
1
7
×60,

=

1
7
×(92+16+60),

=

1
7
×168,

=24.

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