题目内容
用递等式计算(能简便计算的要写出简算过程). 18.24-4.73-5.27 | 8.29×1
| ||||||||||
(
| 0.47×1.25-1
| ||||||||||
(3.375+1
| [4
|
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运用减法的性质简算;
②③④运用乘法分配律简算;
⑤先算括号内的加法,再算括号外的乘法、除法,最后算减法;
⑥先算小括号内的加法,再算中括号内的乘法、减法,最后算除法.
②③④运用乘法分配律简算;
⑤先算括号内的加法,再算括号外的乘法、除法,最后算减法;
⑥先算小括号内的加法,再算中括号内的乘法、减法,最后算除法.
解答:
解:①18.24-4.73-5.27
=18.24-(4.73+5.27)
=18.24-10
=8.24;
②8.29×1
+1
×1.71
=(8.29+1.71)×1
=10×1.6
=16;
③(
+
+
)×24
=
×24+
×24+
×24
=9+6+4
=19;
④0.47×1.25-1
+0.63×125%
=(0.47+0.63-1)×1.25
=0.1×1.25
=0.125;
⑤(3.375+1
)×
-4.2÷1
=5×
-4.2×
=4-2.4
=1.6;
⑥[4
-1.2×(
+1.5)]÷3
=[4
-1.2×
)]÷3
=[4.6-2.6]÷3
=2÷3
=
.
=18.24-(4.73+5.27)
=18.24-10
=8.24;
②8.29×1
3 |
5 |
3 |
5 |
=(8.29+1.71)×1
3 |
5 |
=10×1.6
=16;
③(
3 |
8 |
1 |
4 |
1 |
6 |
=
3 |
8 |
1 |
4 |
1 |
6 |
=9+6+4
=19;
④0.47×1.25-1
1 |
4 |
=(0.47+0.63-1)×1.25
=0.1×1.25
=0.125;
⑤(3.375+1
5 |
8 |
4 |
5 |
3 |
4 |
=5×
4 |
5 |
4 |
7 |
=4-2.4
=1.6;
⑥[4
3 |
5 |
2 |
3 |
=[4
3 |
5 |
13 |
6 |
=[4.6-2.6]÷3
=2÷3
=
2 |
3 |
点评:此题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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