题目内容
计算下面各题怎样简便就怎样算:
×
+
×
; 4÷
-0.6; (
-
)×42;
×
÷
.
| 4 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
| 1 |
| 6 |
| 8 |
| 3 |
| 5 |
| 6 |
| 3 |
| 7 |
| 4 |
| 9 |
| 15 |
| 16 |
| 5 |
| 6 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)运用乘法分配律解答,
(2)按照先算除法,再算减法顺序计算解答,
(4)按照从左到右顺序计算解答.
(2)按照先算除法,再算减法顺序计算解答,
(4)按照从左到右顺序计算解答.
解答:
解:(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)4÷
-0.6
=1.5-0.6
=0.9;
(3)(
-
)×42
=
×42-
×42
=35-18
=17;
(4)
×
÷
=
÷
=
.
| 4 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
| 1 |
| 6 |
=
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 4 |
| 9 |
=
| 4 |
| 9 |
(2)4÷
| 8 |
| 3 |
=1.5-0.6
=0.9;
(3)(
| 5 |
| 6 |
| 3 |
| 7 |
=
| 5 |
| 6 |
| 3 |
| 7 |
=35-18
=17;
(4)
| 4 |
| 9 |
| 15 |
| 16 |
| 5 |
| 6 |
=
| 5 |
| 12 |
| 5 |
| 6 |
=
| 1 |
| 2 |
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用乘法分配律解决问题.
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