题目内容
下面各题,怎么简便怎么算.
| 375+2000÷25÷4 | 14.32-7.4+1.68-3.6 | 24×(
| ||||||||||||||||||
|
(
|
2012×
|
考点:整数四则混合运算,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)运用除法性质解答,
(2)运用加法交换律以及减法性质解答,
(3)(5)(6)运用乘法分配律解答,
(4)按照先算括号里面的加法,再算乘法,最后算减法顺序计算解答.
(2)运用加法交换律以及减法性质解答,
(3)(5)(6)运用乘法分配律解答,
(4)按照先算括号里面的加法,再算乘法,最后算减法顺序计算解答.
解答:
解:(1)375+2000÷25÷4
=375+2000÷(25×4)
=375+2000÷100
=375+20
=395;
(2)14.32-7.4+1.68-3.6
=(14.32+1.68)-(7.4+3.6)
=16-11
=5;
(3)24×(
+
-
)
=24×
+24×
-24×
=2+20-18
=4;
(4)
-(
+
)×
=
-
×
=
-
=
;
(5)(
÷7+
×
)÷
=(
+
)×
÷
=1×
÷
=
;
(6)2012×
+2012÷15×13
=2012×(
+
)
=2012×1
=2012.
=375+2000÷(25×4)
=375+2000÷100
=375+20
=395;
(2)14.32-7.4+1.68-3.6
=(14.32+1.68)-(7.4+3.6)
=16-11
=5;
(3)24×(
| 1 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
=24×
| 1 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
=2+20-18
=4;
(4)
| 5 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 11 |
| 10 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 1 |
| 2 |
=
| 1 |
| 8 |
(5)(
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
| 7 |
| 3 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
| 7 |
| 3 |
=1×
| 1 |
| 7 |
| 7 |
| 3 |
=
| 3 |
| 49 |
(6)2012×
| 2 |
| 15 |
=2012×(
| 2 |
| 15 |
| 13 |
| 15 |
=2012×1
=2012.
点评:本题考查知识点:(1)正确运用简便方法解决问题,(2)依据四则运算计算方法正确进行计算.
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