题目内容
脱式计算
×[(
+
)÷
]
914-316÷79×208
(1-
÷
)×
÷[1-(
+
)].
5 |
11 |
2 |
5 |
1 |
3 |
5 |
6 |
914-316÷79×208
(1-
1 |
5 |
1 |
3 |
15 |
16 |
5 |
6 |
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
×[
×
],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.
5 |
11 |
11 |
15 |
6 |
5 |
(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)
×[(
+
)÷
],
=
×[
÷
],
=
×[
×
],
=
×
×
,
=
;
(2)914-316÷79×208,
=914-4×208,
=914-832,
=82;
(3)(1-
÷
)×
,
=(1-
×3)×
,
=(1-
)×
,
=
×
,
=
;
(4)
÷[1-(
+
)],
=
÷[1-
],
=
÷
,
=
×6,
=5.
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 |
15 |
16 |
=(1-
3 |
5 |
15 |
16 |
=
2 |
5 |
15 |
16 |
=
3 |
8 |
(4)
5 |
6 |
3 |
4 |
1 |
12 |
=
5 |
6 |
5 |
6 |
=
5 |
6 |
1 |
6 |
=
5 |
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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