题目内容
用你喜欢的方法计算
(1)1375+360÷90×250
(2)81÷14+17×
(3)
×(
+
÷
)
(4)
×2008.
(1)1375+360÷90×250
(2)81÷14+17×
| 1 |
| 14 |
(3)
| 3 |
| 5 |
| 1 |
| 7 |
| 8 |
| 21 |
| 2 |
| 3 |
(4)
| 2006 |
| 2007 |
分析:(1)先算除法,再算乘法,最后算加法;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;
(4)先把2008分解成2007+1,再运用乘法分配律简算.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;
(4)先把2008分解成2007+1,再运用乘法分配律简算.
解答:解:(1)1375+360÷90×250,
=1375+40×250,
=1375+1000,
=2375;
(2)81÷14+17×
,
=81×
+17×
,
=(81+17)×
,
=98×
,
=7;
(3)
×(
+
÷
),
=
×(
+
),
=
×
,
=
;
(4)
×2008,
=
×(2007+1),
=
×2007+
×1,
=2007+
,
=2007
.
=1375+40×250,
=1375+1000,
=2375;
(2)81÷14+17×
| 1 |
| 14 |
=81×
| 1 |
| 14 |
| 1 |
| 14 |
=(81+17)×
| 1 |
| 14 |
=98×
| 1 |
| 14 |
=7;
(3)
| 3 |
| 5 |
| 1 |
| 7 |
| 8 |
| 21 |
| 2 |
| 3 |
=
| 3 |
| 5 |
| 1 |
| 7 |
| 4 |
| 7 |
=
| 3 |
| 5 |
| 5 |
| 7 |
=
| 3 |
| 7 |
(4)
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
| 2006 |
| 2007 |
=2007+
| 2006 |
| 2007 |
=2007
| 2006 |
| 2007 |
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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