题目内容
用递等式计算(能简便的用简便方法计算)
56×(
+
) 8.7-(5.44-3.5)÷0.4
(
+
×
)÷
÷[
×(
+
)].
56×(
| 4 |
| 7 |
| 5 |
| 8 |
(
| 7 |
| 16 |
| 3 |
| 4 |
| 5 |
| 12 |
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
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
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算小括号里面的减法,再算除法,最后算括号外面的减法;
(3)先算乘法,再算加法,最后算除法;
(4)先算加法,再算乘法,最后算除法.
(2)先算小括号里面的减法,再算除法,最后算括号外面的减法;
(3)先算乘法,再算加法,最后算除法;
(4)先算加法,再算乘法,最后算除法.
解答:
解:(1)56×(
+
)
=56×
+56×
=32+35
=67;
(2)8.7-(5.44-3.5)÷0.4
=8.7-1.94÷0.4
=8.7-4.85
=3.85;
(3)(
+
×
)÷
=(
+
)÷
=
÷
=
;
(4)
÷[
×(
+
)]
=
÷[
×
]
=
÷
=
.
| 4 |
| 7 |
| 5 |
| 8 |
=56×
| 4 |
| 7 |
| 5 |
| 8 |
=32+35
=67;
(2)8.7-(5.44-3.5)÷0.4
=8.7-1.94÷0.4
=8.7-4.85
=3.85;
(3)(
| 7 |
| 16 |
| 3 |
| 4 |
| 5 |
| 12 |
| 9 |
| 20 |
=(
| 7 |
| 16 |
| 5 |
| 16 |
| 9 |
| 20 |
=
| 3 |
| 4 |
| 9 |
| 20 |
=
| 5 |
| 3 |
(4)
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=
| 3 |
| 2 |
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