题目内容
计算,能简算的要简算.
4
|
(
|
(
| ||||||||||||||||||
| 62×3.14+82×3.14 | 3.68×[1÷(2
|
(
|
考点:分数的简便计算,整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:把4
-1
-0.125中的0.125化成
,进而按照减去两个数,改写成减去两个数的和简算;
(
+
-
)×72,运用乘法分配律简算;
(
-
÷
)×
,按照先算括号里面的,再算括号外面的顺序计算;
62×3.14+82×3.14,逆用乘法分配律简算;
3.68×[1÷(2
-2.09 )],先算小括号里面的减法,再算中括号里面的除法,最后算中括号外面的乘法;
(
+
)×
+
,前面运用乘法分配律简算,后面运用加法结合律简算.
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 8 |
(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
(
| 2 |
| 3 |
| 1 |
| 3 |
| 5 |
| 9 |
| 9 |
| 10 |
62×3.14+82×3.14,逆用乘法分配律简算;
3.68×[1÷(2
| 1 |
| 10 |
(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
解答:
解:4
-1
-0.125
=4
-(1
+
)
=4
-2
=2
(
+
-
)×72
=
×72+
×72-
×72
=30+8-27
=11
(
-
÷
)×
=(
-
)×
=
×
=
62×3.14+82×3.14
=(62+82)×3.14
=100×3.14
=314
3.68×[1÷(2
-2.09 )]
=3.68×[1÷0.01]
=3.68×100
=368
(
+
)×
+
=
×
+
×
+
=
+
+
=
+
=
.
| 5 |
| 6 |
| 7 |
| 8 |
=4
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 8 |
=4
| 5 |
| 6 |
=2
| 5 |
| 6 |
(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8-27
=11
(
| 2 |
| 3 |
| 1 |
| 3 |
| 5 |
| 9 |
| 9 |
| 10 |
=(
| 2 |
| 3 |
| 3 |
| 5 |
| 9 |
| 10 |
=
| 1 |
| 15 |
| 9 |
| 10 |
=
| 3 |
| 50 |
62×3.14+82×3.14
=(62+82)×3.14
=100×3.14
=314
3.68×[1÷(2
| 1 |
| 10 |
=3.68×[1÷0.01]
=3.68×100
=368
(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 19 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 19 |
| 2 |
| 17 |
| 5 |
| 17 |
=
| 3 |
| 19 |
| 7 |
| 17 |
=
| 184 |
| 323 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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