题目内容
准确计算:(怎样简便就怎样算)
÷
+
×
×
+
÷
45×
×4-(
+
)
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 5 |
| 2 |
45×
| 43 |
| 44 |
| 5 |
| 6 |
| 7 |
| 8 |
| 2 |
| 3 |
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)按照先同时计算乘法和除法,再算加法顺序计算解答,
(2)(3)运用乘法分配律解答,
(4)按照先算括号里面的,再算乘法,最后算减法顺序计算解答.
(2)(3)运用乘法分配律解答,
(4)按照先算括号里面的,再算乘法,最后算减法顺序计算解答.
解答:
解:(1)
÷
+
×
=
+
=
;
(2)
×
+
÷
=
×(
+
)
=
×1
=
;
(3)45×
=44×
+1×
=43+
=43
;
(4)
×4-(
+
)
=
×4-
=
-
=1
.
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
=
| 4 |
| 5 |
| 3 |
| 20 |
=
| 19 |
| 20 |
(2)
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 5 |
| 2 |
=
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(3)45×
| 43 |
| 44 |
=44×
| 43 |
| 44 |
| 43 |
| 44 |
=43+
| 43 |
| 44 |
=43
| 43 |
| 44 |
(4)
| 5 |
| 6 |
| 7 |
| 8 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 37 |
| 24 |
=
| 10 |
| 3 |
| 37 |
| 24 |
=1
| 19 |
| 24 |
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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