题目内容
能简算的用简便方法计算:
6.5×8+
|
|
|
9.6×18+0.4×18 | 0.7+3.9+4.3+6.1 |
分析:(1)先同时运算乘法,再算加法;
(2)先算小括号里面的除法,再算括号外的乘法;
(3)先算除法,再算加法;
(4)运用乘法分配律简算;
(5)根据加法交换律和结合律简算.
(2)先算小括号里面的除法,再算括号外的乘法;
(3)先算除法,再算加法;
(4)运用乘法分配律简算;
(5)根据加法交换律和结合律简算.
解答:解:(1)6.5×8+
×
,
=52+2,
=54;
(2)
×(
÷
),
=
×
,
=
;
(3)
÷
+
,
=
+
,
=
;
(4)9.6×18+0.4×18,
=(9.6+0.4)×18,
=10×18,
=180;
(5)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15.
7 |
2 |
4 |
7 |
=52+2,
=54;
(2)
3 |
4 |
1 |
2 |
5 |
8 |
=
3 |
4 |
4 |
5 |
=
3 |
5 |
(3)
3 |
25 |
1 |
10 |
1 |
5 |
=
6 |
5 |
1 |
5 |
=
7 |
5 |
(4)9.6×18+0.4×18,
=(9.6+0.4)×18,
=10×18,
=180;
(5)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15.
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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