题目内容
(2012?陆良县)用递等式计算.
(1)1292+540÷18×24 | (2)1.05×(3.8-0.8)÷6.3 | ||||||||||||||
(3)
|
(4)[1-(
|
分析:(1)先算除法,再算乘法,最后算加法;
(2)先算减法,再算乘法,最后算除法;
(3)先算加法,再算乘法,最后算除法;
(4)先算加法,再算减法;最后算除法.
(2)先算减法,再算乘法,最后算除法;
(3)先算加法,再算乘法,最后算除法;
(4)先算加法,再算减法;最后算除法.
解答:解:(1)1292+540÷18×24,
=1292+30×24,
=1292+720,
=2012;
(2)1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
(3)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
;
(4)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
.
=1292+30×24,
=1292+720,
=2012;
(2)1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
(3)
9 |
20 |
1 |
2 |
2 |
5 |
4 |
5 |
=
9 |
20 |
1 |
2 |
6 |
5 |
=
9 |
20 |
3 |
5 |
=
3 |
4 |
(4)[1-(
1 |
4 |
3 |
8 |
15 |
16 |
=[1-
5 |
8 |
15 |
16 |
=
3 |
8 |
15 |
16 |
=
2 |
5 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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