题目内容
| 怎样算简便就怎样算. 360÷15-2.5×1.4 |
| 2.5×(1.9+1.9+1.9+1.9) | ||||||||||||
| 3.64÷4+4.36×25% |
|
考点:分数的四则混合运算,运算定律与简便运算,小数四则混合运算,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:(1)先算除法和乘法,再算减法;
(2)根据加法交换律和结合律进行简算;
(3)先算除法,再算减法;
(4)根据乘法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)原式先加上
,再减去
,然后再根据加法结合律进行简算.
(2)根据加法交换律和结合律进行简算;
(3)先算除法,再算减法;
(4)根据乘法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)原式先加上
| 1 |
| 64 |
| 1 |
| 64 |
解答:
解:(1)360÷15-2.5×1.4
=24-3.5
=20.5;
(2)
-
+
-
=(
+
)-(
+
)
=2-1
=1;
(3)6÷
-
÷6
=10-
=9
;
(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(1.9×4)
=(2.5×4)×1.9
=10×1.9
=19;
(5)3.64÷4+4.36×25%
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(6)
+
+
+
+
=
+
+
+
+
+
-
=
+
+
+
+(
+
)-
=
+
+
+
+
-
=
+
+
+(
+
)-
=
+
+
+
-
=
+
+(
+
)-
=
+
+
-
=
+(
+
)-
=
+
-
=
-
=
.
=24-3.5
=20.5;
(2)
| 10 |
| 7 |
| 2 |
| 5 |
| 4 |
| 7 |
| 3 |
| 5 |
=(
| 10 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
| 3 |
| 5 |
=2-1
=1;
(3)6÷
| 3 |
| 5 |
| 3 |
| 5 |
=10-
| 1 |
| 10 |
=9
| 9 |
| 10 |
(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(1.9×4)
=(2.5×4)×1.9
=10×1.9
=19;
(5)3.64÷4+4.36×25%
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(6)
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 64 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 64 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 32 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 64 |
=
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 64 |
=
| 1 |
| 2 |
| 1 |
| 64 |
=
| 31 |
| 64 |
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.
练习册系列答案
相关题目