题目内容
计算下面各题,能简算的要简算:
7.54+
+2.46+
0.4÷
+
×
÷(
-
×
)
99×
+
.
7.54+
| 12 |
| 7 |
| 16 |
| 7 |
0.4÷
| 15 |
| 4 |
| 2 |
| 5 |
| 4 |
| 15 |
| 3 |
| 23 |
| 6 |
| 7 |
| 5 |
| 6 |
| 3 |
| 10 |
99×
| 23 |
| 25 |
| 23 |
| 25 |
分析:(1)先变形为(7.54+2.46)+(
+
),再计算即可;
(2)(4)可据乘法分配律进行计算;
(3)先算括号里面的,再算括号外面的除法.
| 12 |
| 7 |
| 16 |
| 7 |
(2)(4)可据乘法分配律进行计算;
(3)先算括号里面的,再算括号外面的除法.
解答:解:7.54+
+2.46+
,
=(7.54+2.46)+(
+
),
=10+4,
=14;
0.4÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
÷(
-
×
),
=
÷(
-
),
=
÷
,
=
;
99×
+
,
=(99+1)×
,
=100×
,
=92.
| 12 |
| 7 |
| 16 |
| 7 |
=(7.54+2.46)+(
| 12 |
| 7 |
| 16 |
| 7 |
=10+4,
=14;
0.4÷
| 15 |
| 4 |
| 2 |
| 5 |
| 4 |
| 15 |
=
| 2 |
| 5 |
| 4 |
| 15 |
| 2 |
| 5 |
| 4 |
| 15 |
=
| 2 |
| 5 |
| 4 |
| 15 |
| 4 |
| 15 |
=
| 2 |
| 5 |
| 8 |
| 15 |
=
| 16 |
| 75 |
| 3 |
| 23 |
| 6 |
| 7 |
| 5 |
| 6 |
| 3 |
| 10 |
=
| 3 |
| 23 |
| 6 |
| 7 |
| 1 |
| 4 |
=
| 3 |
| 23 |
| 17 |
| 28 |
=
| 84 |
| 391 |
99×
| 23 |
| 25 |
| 23 |
| 25 |
=(99+1)×
| 23 |
| 25 |
=100×
| 23 |
| 25 |
=92.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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