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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