题目内容
(2013?宜丰县模拟)脱式计算.
0.6+32×0.25-6 |
|
1.05×(3.8-0.8)÷6.3 |
|
分析:(1)先算乘法,再算加法,最后算减法;
(2)先算加法,再算乘法,最后算除法;
(3)先算减法,再算乘法,最后算除法;
(4)根据加法交换律和乘法分配律进行计算.
(2)先算加法,再算乘法,最后算除法;
(3)先算减法,再算乘法,最后算除法;
(4)根据加法交换律和乘法分配律进行计算.
解答:解:
(1)0.6+32×0.25-6,
=0.6+8-6,
=8.6-6,
=2.6;
(2)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=5;
(3)1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
(4)
+
×99+
,
=(
+
)+
×99,
=
+
×99,
=
×(99+1),
=
×100,
=
.
(1)0.6+32×0.25-6,
=0.6+8-6,
=8.6-6,
=2.6;
(2)
1 |
3 |
2 |
3 |
1 |
5 |
1 |
13 |
=
1 |
3 |
13 |
15 |
1 |
13 |
=
1 |
3 |
1 |
15 |
=5;
(3)1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
(4)
3 |
14 |
4 |
7 |
5 |
14 |
=(
3 |
14 |
5 |
14 |
4 |
7 |
=
4 |
7 |
4 |
7 |
=
4 |
7 |
=
4 |
7 |
=
400 |
7 |
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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