题目内容
怎样算简便就怎样算.
2.6×
+2
÷
2.4÷[
×(1.5-
)]
×
÷(
-
)
+
÷
-
.
2.6×
| 5 |
| 13 |
| 3 |
| 5 |
| 13 |
| 8 |
2.4÷[
| 2 |
| 3 |
| 3 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 18 |
| 1 |
| 4 |
| 3 |
| 4 |
| 6 |
| 11 |
| 3 |
| 8 |
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)运用乘法分配律解答,
(2)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答,
(3)按照先算括号里面的,再从左到右顺序计算解答,
(4)运用加法结合律解答.
(2)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答,
(3)按照先算括号里面的,再从左到右顺序计算解答,
(4)运用加法结合律解答.
解答:
解:(1)2.6×
+2
÷
=2.6×(
+
)
=2.6×1
=2.6;
(2)2.4÷[
×(1.5-
)]
=2.4÷[
×1
]
=2.4÷
=3.2;
(3)
×
÷(
-
)
=
×
÷
=
÷
=
;
(4)
+
÷
-
=
+(
-
)
=
+1
=1
.
| 5 |
| 13 |
| 3 |
| 5 |
| 13 |
| 8 |
=2.6×(
| 5 |
| 13 |
| 8 |
| 13 |
=2.6×1
=2.6;
(2)2.4÷[
| 2 |
| 3 |
| 3 |
| 8 |
=2.4÷[
| 2 |
| 3 |
| 1 |
| 8 |
=2.4÷
| 3 |
| 4 |
=3.2;
(3)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 18 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 16 |
| 45 |
=
| 1 |
| 9 |
| 16 |
| 45 |
=
| 5 |
| 16 |
(4)
| 1 |
| 4 |
| 3 |
| 4 |
| 6 |
| 11 |
| 3 |
| 8 |
=
| 1 |
| 4 |
| 11 |
| 8 |
| 3 |
| 8 |
=
| 1 |
| 4 |
=1
| 1 |
| 4 |
点评:本题主要考查学生依据四则运算计算方法,以及运用简便方法解决问题的能力.
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