题目内容
(2012?泗县模拟)
能简算的要简算 1.6×240-16×14 |
83.3-4.14-5.86 | ||||||||||||
|
|
分析:(1)、(3)运用乘法的分配律进行计算即可;(2)运用一个数连续减去2个数,可以用这一个数减去这两个数的和进行计算.(4)按照分数的四则混合运算的顺序进行计算,两级运算先做乘除后做加减.
解答:解:(1)1.6×240-16×14,
=1.6×240-1.6×140,
=1.6×(240-140),
=160;
(2)83.3-4.14-5.86,
=83.3-(4.14+5.86),
=83.3-10,
=73.3;
(3)
×9-
×6,
=
×(9-6),
=
×3,
=1
;
(4)
-(
+
)÷
,
=
-(
+
)×
,
=
-
×
,
=
-
,
=0.1;
=1.6×240-1.6×140,
=1.6×(240-140),
=160;
(2)83.3-4.14-5.86,
=83.3-(4.14+5.86),
=83.3-10,
=73.3;
(3)
11 |
18 |
11 |
18 |
=
11 |
18 |
=
11 |
18 |
=1
5 |
6 |
(4)
9 |
10 |
1 |
4 |
7 |
20 |
3 |
4 |
=
9 |
10 |
5 |
20 |
7 |
20 |
4 |
3 |
=
9 |
10 |
12 |
20 |
4 |
3 |
=
9 |
10 |
8 |
10 |
=0.1;
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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