题目内容
(2013?抚州模拟)
| 计算(能简算的要简算) ①14-18.9÷0.18×0.12 |
②5
| ||||||||||||||||
③(
|
④
|
分析:①先算除法,再算乘法,最后算减法;
②先算除法和乘法,再根据减法的性质进行简算;
③根据乘法分配律进行简算;
④先算减法,再算乘法,最后算除法.
②先算除法和乘法,再根据减法的性质进行简算;
③根据乘法分配律进行简算;
④先算减法,再算乘法,最后算除法.
解答:解:①14-18.9÷0.18×0.12
=14-105×0.12
=14-12.6
=1.4;
②5
-15÷19-
×2
=5
-
-
=5
-(
+
)
=5
-1
=4
;
③(
+
-
)÷
=(
+
-
)×24
=
×24+
×24-
×24
=20+21-10
=41-10
=31;
④
÷[
×(
-
)]
=
÷[
×
]
=
÷
=
.
=14-105×0.12
=14-12.6
=1.4;
②5
| 3 |
| 4 |
| 2 |
| 19 |
=5
| 3 |
| 4 |
| 15 |
| 19 |
| 4 |
| 19 |
=5
| 3 |
| 4 |
| 15 |
| 19 |
| 4 |
| 19 |
=5
| 3 |
| 4 |
=4
| 3 |
| 4 |
③(
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 24 |
=(
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
=20+21-10
=41-10
=31;
④
| 9 |
| 20 |
| 3 |
| 4 |
| 3 |
| 5 |
| 1 |
| 10 |
=
| 9 |
| 20 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 9 |
| 20 |
| 3 |
| 8 |
=
| 6 |
| 5 |
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定律简便计算.
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