题目内容
计算下面各题,怎样算简便就怎样算.
3720-4028÷38 | 78.192÷7.2-5.3×2.04 | 19÷(
|
43×
|
分析:(1)先算除法,再算减法;
(2)先同时运算除法和乘法,再算减法;
(3)先算小括号里面的加法,再算括号外的除法;
(4)先把除法变成乘法,再运用乘法分配律简算.
(2)先同时运算除法和乘法,再算减法;
(3)先算小括号里面的加法,再算括号外的除法;
(4)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)3720-4028÷38,
=3720-106,
=3614;
(2)78.192÷7.2-5.3×2.04,
=10.86-10.812,
=0.048;
(3)19÷(
+
),
=19÷
,
=20;
(4)43×
+57÷
,
=43×
+57×
,
=(43+57)×
,
=100×
,
=75.
=3720-106,
=3614;
(2)78.192÷7.2-5.3×2.04,
=10.86-10.812,
=0.048;
(3)19÷(
3 |
4 |
1 |
5 |
=19÷
19 |
20 |
=20;
(4)43×
3 |
4 |
4 |
3 |
=43×
3 |
4 |
3 |
4 |
=(43+57)×
3 |
4 |
=100×
3 |
4 |
=75.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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