题目内容
怎样简便计算就怎样简便计算
×
+
÷4; (
-
+
)×12; 97×
.
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 23 |
| 96 |
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)把除法转化为乘法,再运用乘法分配律简算;
(2)运用乘法分配律简算;
(3)把97化为96+1,再运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)把97化为96+1,再运用乘法分配律简算.
解答:
解:(1)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×
=
;
(2)(
-
+
)×12
=
×12-
×12+
×12
=6-4+2
=4;
(3)97×
=(96+1)×
=96×
+1×
=23+
=23
.
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 11 |
| 18 |
=
| 11 |
| 72 |
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=6-4+2
=4;
(3)97×
| 23 |
| 96 |
=(96+1)×
| 23 |
| 96 |
=96×
| 23 |
| 96 |
| 23 |
| 96 |
=23+
| 23 |
| 96 |
=23
| 23 |
| 96 |
点评:本题考查了整数、分数的四则混合运算,关键是仔细审题,根据数字以及运算符号特点,选用适当的运算律及运算性质进行简算.
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