题目内容

脱式计算
5
11
×[(
2
5
+
1
3
)÷
5
6
]
914-316÷79×208
(1-
1
5
÷
1
3
)×
15
16
                      
5
6
÷[1-(
3
4
+
1
12
)].
分析:(1)先算小括号内的,把除法改为乘法,原式变为
5
11
×[
11
15
×
6
5
],去括号,约分简算;
(2)先算除法和乘法,再算减法;
(3)先算括号内的除法,再算括号内的减法,最后算括号外的乘法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)
5
11
×[(
2
5
+
1
3
)÷
5
6
],
=
5
11
×[
11
15
÷
5
6
],
=
5
11
×[
11
15
×
6
5
],
=
5
11
×
11
15
×
6
5

=
2
5


(2)914-316÷79×208,
=914-4×208,
=914-832,
=82;

(3)(1-
1
5
÷
1
3
)×
15
16

=(1-
1
5
×3)×
15
16

=(1-
3
5
)×
15
16

=
2
5
×
15
16

=
3
8


(4)
5
6
÷[1-(
3
4
+
1
12
)],
=
5
6
÷[1-
5
6
],
=
5
6
÷
1
6

=
5
6
×6,
=5.
点评:此题主要考查分数、整数的四则混合运算的运算顺序以及灵活简算.
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