题目内容
计算题.
2
×
+3
÷
; 4
×1.5-
÷0.24;
5
×3
+5
÷
; (
-
+
)×24;
(
+0.375)÷(1-
×
)×1
;[1.1+7÷(3
-1
)]×1
.
2
| 7 |
| 10 |
| 5 |
| 9 |
| 1 |
| 3 |
| 8 |
| 9 |
| 2 |
| 3 |
| 7 |
| 25 |
5
| 2 |
| 11 |
| 3 |
| 4 |
| 2 |
| 11 |
| 4 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
(
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 25 |
| 1 |
| 12 |
| 5 |
| 8 |
| 1 |
| 59 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)按照先同时算第二级运算,再算第一级运算顺序计算解答,
(3)(4)运用乘法分配律解答,
(5)按照先算小括号里面的,再从左到右顺序计算解答,
(6)按照先算小括号里面的,再算中括号里面的除法,然后算中括号里面的加法,整数括号外面的顺序计算解答.
(3)(4)运用乘法分配律解答,
(5)按照先算小括号里面的,再从左到右顺序计算解答,
(6)按照先算小括号里面的,再算中括号里面的除法,然后算中括号里面的加法,整数括号外面的顺序计算解答.
解答:
解:(1)2
×
+3
÷
=
+
=5
;
(2)4
×1.5-
÷0.24
=7-1
=5
;
(3)5
×3
+5
÷
=5
×(3
+
)
=5
×5
=25
;
(4)(
-
+
)×24
=
×24-
×24+
×24
=18-16+4
=6;
(5)(
+0.375)÷(1-
×
)×1
=
÷(1-
)×1
=
÷
×1
=
×1
=1;
(6)[1.1+7÷(3
-1
)]×1
=[1.1+7÷
]×1
=[1.1+
]×1
=5.9×1
=6.
| 7 |
| 10 |
| 5 |
| 9 |
| 1 |
| 3 |
| 8 |
| 9 |
=
| 3 |
| 2 |
| 15 |
| 4 |
=5
| 1 |
| 4 |
(2)4
| 2 |
| 3 |
| 7 |
| 25 |
=7-1
| 1 |
| 6 |
=5
| 5 |
| 6 |
(3)5
| 2 |
| 11 |
| 3 |
| 4 |
| 2 |
| 11 |
| 4 |
| 5 |
=5
| 2 |
| 11 |
| 3 |
| 4 |
| 5 |
| 4 |
=5
| 2 |
| 11 |
=25
| 10 |
| 11 |
(4)(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=18-16+4
=6;
(5)(
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 25 |
=
| 5 |
| 8 |
| 3 |
| 10 |
| 3 |
| 25 |
=
| 5 |
| 8 |
| 7 |
| 10 |
| 3 |
| 25 |
=
| 25 |
| 28 |
| 3 |
| 25 |
=1;
(6)[1.1+7÷(3
| 1 |
| 12 |
| 5 |
| 8 |
| 1 |
| 59 |
=[1.1+7÷
| 35 |
| 24 |
| 1 |
| 59 |
=[1.1+
| 24 |
| 5 |
| 1 |
| 59 |
=5.9×1
| 1 |
| 59 |
=6.
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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