题目内容
认真计算下面各题,能简便的要简便算. (
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36×25-910÷26 |
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分析:(1)、(2)运用乘法分配律计算,
(3)、(4)依据四则混合运算的顺序计算,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.
(3)、(4)依据四则混合运算的顺序计算,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.
解答:解:(1)(
+
-
)×72,
=
×72+
×72-
×72,
=56+60-18,
=116-18,
=98;
(2)
÷
+
×
,
=
×(
+
),
=
×1,
=
;
(3)36×25-910÷26,
=900-35,
=865;
(4)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
.
7 |
9 |
5 |
6 |
1 |
4 |
=
7 |
9 |
5 |
6 |
1 |
4 |
=56+60-18,
=116-18,
=98;
(2)
18 |
23 |
8 |
5 |
18 |
23 |
3 |
8 |
=
18 |
23 |
5 |
8 |
3 |
8 |
=
18 |
23 |
=
18 |
23 |
(3)36×25-910÷26,
=900-35,
=865;
(4)
2 |
9 |
4 |
5 |
2 |
9 |
18 |
23 |
=
2 |
9 |
46 |
45 |
18 |
23 |
=
2 |
9 |
4 |
5 |
=
5 |
18 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.解答时注意计算的准确性.
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