题目内容
计算,能简算的要简算 (1)375+450÷18×25 |
(2)4.38×5.6+56.2×0.56 | ||||||||||||||||
(3)
|
(4)
|
分析:(1)先算除法,再算乘法,最后算加法;
(2)先根据积不变规律把56.2×0.56变成5.62×5.6,再运用乘法分配律简算;
(3)运用加法结合律以及减法的性质简算;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的除法.
(2)先根据积不变规律把56.2×0.56变成5.62×5.6,再运用乘法分配律简算;
(3)运用加法结合律以及减法的性质简算;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的除法.
解答:解:(1)375+450÷18×25,
=375+25×25,
=375+625,
=1000.
(2)4.38×5.6+56.2×0.56,
=4.38×5.6+5.62×5.6,
=(4.38+5.62)×5.6,
=10×5.6,
=56;
(3)
-
-
+
,
=(
+
)-(
+
),
=2-1,
=1;
(4)
÷(
-
×
),
=
÷(
-
),
=
÷
,
=
.
=375+25×25,
=375+625,
=1000.
(2)4.38×5.6+56.2×0.56,
=4.38×5.6+5.62×5.6,
=(4.38+5.62)×5.6,
=10×5.6,
=56;
(3)
11 |
10 |
1 |
4 |
3 |
4 |
9 |
10 |
=(
11 |
10 |
9 |
10 |
1 |
4 |
3 |
4 |
=2-1,
=1;
(4)
4 |
15 |
13 |
9 |
2 |
3 |
5 |
6 |
=
4 |
15 |
13 |
9 |
5 |
9 |
=
4 |
15 |
8 |
9 |
=
3 |
10 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
练习册系列答案
相关题目