题目内容
用你喜欢的方法算.
(
+
)×8
5.46×101-5.46
111×5+9÷
0.72×6.7+7.2×33%
180×[
-(
+
)].
(
| 5 |
| 16 |
| 3 |
| 8 |
5.46×101-5.46
111×5+9÷
| 1 |
| 5 |
0.72×6.7+7.2×33%
180×[
| 3 |
| 4 |
| 5 |
| 14 |
| 1 |
| 7 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算加法,再算减法,最后算乘法.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算加法,再算减法,最后算乘法.
解答:
解:(1)(
+
)×8
=
×8+
×8
=
+3
=5
;
(2)5.46×101-5.46
=5.46×(101-1)
=5.46×100
=546;
(3)111×5+9÷
=111×5+9×5
=(111+9)×5
=120×5
=600;
(4)0.72×6.7+7.2×33%
=7.2×0.67+7.2×33%
=7.2×(0.67+33%)
=7.2×1
=7.2;
(5)180×[
-(
+
)]
=180×[
-
]
=180×
=45.
| 5 |
| 16 |
| 3 |
| 8 |
=
| 5 |
| 16 |
| 3 |
| 8 |
=
| 5 |
| 2 |
=5
| 1 |
| 2 |
(2)5.46×101-5.46
=5.46×(101-1)
=5.46×100
=546;
(3)111×5+9÷
| 1 |
| 5 |
=111×5+9×5
=(111+9)×5
=120×5
=600;
(4)0.72×6.7+7.2×33%
=7.2×0.67+7.2×33%
=7.2×(0.67+33%)
=7.2×1
=7.2;
(5)180×[
| 3 |
| 4 |
| 5 |
| 14 |
| 1 |
| 7 |
=180×[
| 3 |
| 4 |
| 1 |
| 2 |
=180×
| 1 |
| 4 |
=45.
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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