题目内容
(2012?乐至县模拟)计算下面各题,能简算的要简算.
(1)6
-5.08×(0.875-
)
(2)42
-11
-23
(3)6.58×1
+3.42÷
(4)2.4×(
-
)÷1
(5)[4+(1
-0.75)÷2
]×2
.
(1)6
| 3 |
| 5 |
| 5 |
| 8 |
(2)42
| 5 |
| 7 |
| 7 |
| 8 |
| 9 |
| 17 |
(3)6.58×1
| 3 |
| 5 |
| 5 |
| 8 |
(4)2.4×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 7 |
(5)[4+(1
| 5 |
| 6 |
| 8 |
| 9 |
| 1 |
| 7 |
分析:(1)(2)(4)(5)依据四则运算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,
(3)运用乘法分配律解答.
(3)运用乘法分配律解答.
解答:解:(1)6
-5.08×(0.875-
),
=6
-5.08×0.25,
=6
-1.27,
=5.33;
(2)42
-11
-23
,
=30
-23
,
=7
;
(3)6.58×1
+3.42÷
,
=1
×(6.58+3.42),
=1
×10,
=16;
(4)2.4×(
-
)÷1
,
=2.4×
÷1
,
=0.4÷1
,
=0.35;
(5)[4+(1
-0.75)÷2
]×2
,
=[4+1
÷2
]×2
,
=[4+
]×2
,
=4
×2
,
=9
.
| 3 |
| 5 |
| 5 |
| 8 |
=6
| 3 |
| 5 |
=6
| 3 |
| 5 |
=5.33;
(2)42
| 5 |
| 7 |
| 7 |
| 8 |
| 9 |
| 17 |
=30
| 47 |
| 56 |
| 9 |
| 17 |
=7
| 295 |
| 952 |
(3)6.58×1
| 3 |
| 5 |
| 5 |
| 8 |
=1
| 3 |
| 5 |
=1
| 3 |
| 5 |
=16;
(4)2.4×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 7 |
=2.4×
| 1 |
| 6 |
| 1 |
| 7 |
=0.4÷1
| 1 |
| 7 |
=0.35;
(5)[4+(1
| 5 |
| 6 |
| 8 |
| 9 |
| 1 |
| 7 |
=[4+1
| 1 |
| 12 |
| 8 |
| 9 |
| 1 |
| 7 |
=[4+
| 3 |
| 8 |
| 1 |
| 7 |
=4
| 3 |
| 8 |
| 1 |
| 7 |
=9
| 3 |
| 8 |
点评:本题考查知识点:(1)依据四则运算顺序进行计算,(2)正确运用乘法分配律.
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