问题 解答题
脱式计算(能简便计算的要简便计算).
4
7
÷
11
5
+
3
7
×
5
11

5
6
÷[1-(
3
4
+
1
16
)]

1.25×(0.8+8+80)
答案

(1)

4
7
÷
11
5
+
3
7
×
5
11

=

4
7
×
5
11
+
3
7
×
5
11

=(

4
7
+
3
7
)×
5
11

=1×

5
11

=

5
11

(2)

5
6
÷[1-(
3
4
+
1
16
)]

=

5
6
÷[1-
13
16
]

=

5
6
÷
3
16

=

5
6
×
16
3

=

40
9

(3)1.25×(0.8+8+80)

=1.25×0.8+1.25×8+1.25×80

=1+10+100

=111.

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