题目内容
计算下面各题,怎样简便就怎样计算
(1)(2-0.6)÷
;
(2)(
+
)×
;
(3)2-
÷
-
;
(4)(0.6-
)×(
+
);
(5)12×(
-
);
(6)
×
-
×
.
(1)(2-0.6)÷
| 7 |
| 15 |
(2)(
| 5 |
| 6 |
| 5 |
| 8 |
| 4 |
| 25 |
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
(4)(0.6-
| 3 |
| 10 |
| 2 |
| 9 |
| 1 |
| 3 |
(5)12×(
| 2 |
| 3 |
| 1 |
| 4 |
(6)
| 5 |
| 8 |
| 7 |
| 10 |
| 7 |
| 10 |
| 1 |
| 4 |
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)先算括号里的,把结果化为分数,再把除法转化为乘法计算;
(2)(5)(6)运用乘法分配律简算;
(3)先算除法,再运用减法的性质简算;
(4)先算括号里的加减,再算乘法.
(2)(5)(6)运用乘法分配律简算;
(3)先算除法,再运用减法的性质简算;
(4)先算括号里的加减,再算乘法.
解答:
解:(1)(2-0.6)÷
=
×
=3;
(2)(
+
)×
=
×
+
×
=
+
=
;
(3)2-
÷
-
=2-
×
-
=2-
-
=2-(
+
)
=2-2
=0;
(4)(0.6-
)×(
+
)
=
×
=
;
(5)12×(
-
)
=12×
-12×
=8-3
=5;
(6)
×
-
×
=(
-
)×
=
×
=
.
| 7 |
| 15 |
=
| 7 |
| 5 |
| 15 |
| 7 |
=3;
(2)(
| 5 |
| 6 |
| 5 |
| 8 |
| 4 |
| 25 |
=
| 5 |
| 6 |
| 4 |
| 25 |
| 5 |
| 8 |
| 4 |
| 25 |
=
| 2 |
| 15 |
| 1 |
| 10 |
=
| 7 |
| 30 |
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0;
(4)(0.6-
| 3 |
| 10 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 3 |
| 10 |
| 5 |
| 9 |
=
| 1 |
| 6 |
(5)12×(
| 2 |
| 3 |
| 1 |
| 4 |
=12×
| 2 |
| 3 |
| 1 |
| 4 |
=8-3
=5;
(6)
| 5 |
| 8 |
| 7 |
| 10 |
| 7 |
| 10 |
| 1 |
| 4 |
=(
| 5 |
| 8 |
| 1 |
| 4 |
| 7 |
| 10 |
=
| 3 |
| 8 |
| 7 |
| 10 |
=
| 21 |
| 80 |
点评:这类型的题目先观察算式,看能不能运用简便运算的方法简算,若不能就要按照运算法则运算.
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