题目内容
怎样算简便就怎样算.
|
37×
|
7×
| ||||||||||||||||
|
48×(
|
23×
|
分析:(1)按照先算括号里面的加法,再算乘法,最后算加法顺序解答;
(2)(3)(5)(6)运用乘法分配律解答;
(4)按照先算乘法,再算除法,最后算加法顺序解答.
(2)(3)(5)(6)运用乘法分配律解答;
(4)按照先算乘法,再算除法,最后算加法顺序解答.
解答:解:(1)
+(
+
)×
=
+
×
=
+
=
;
(2)37×
=36×
+1×
=25+
=25
;
(3)7×
+
÷
=(7+5)×
=12×
=9;
(4)
+
×
÷
=
+
÷
=
+
=
;
(5)48×(
+
)
=48×
+
×48
=28+36
=64;
(6)23×
+14×
=(23+16)×
=39×
=14.
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 15 |
| 14 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 3 |
| 10 |
=
| 29 |
| 30 |
(2)37×
| 25 |
| 36 |
=36×
| 25 |
| 36 |
| 25 |
| 36 |
=25+
| 25 |
| 36 |
=25
| 25 |
| 36 |
(3)7×
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 5 |
=(7+5)×
| 3 |
| 4 |
=12×
| 3 |
| 4 |
=9;
(4)
| 1 |
| 12 |
| 1 |
| 4 |
| 7 |
| 6 |
| 3 |
| 8 |
=
| 1 |
| 12 |
| 7 |
| 24 |
| 3 |
| 8 |
=
| 1 |
| 12 |
| 7 |
| 9 |
=
| 31 |
| 36 |
(5)48×(
| 7 |
| 12 |
| 3 |
| 4 |
=48×
| 7 |
| 12 |
| 3 |
| 4 |
=28+36
=64;
(6)23×
| 14 |
| 39 |
| 16 |
| 39 |
=(23+16)×
| 14 |
| 39 |
=39×
| 14 |
| 39 |
=14.
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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