题目内容
(2011?武昌区)递等式计算:
360-225÷15×18 |
|
4.72-1.16-2.84 |
|
分析:(1)先算除法,再算乘法,最后算减法;
(2)按照从左到右的顺序计算;
(3)根据减法的性质简算;
(4)先算除法,再根据加法交换律简算.
(2)按照从左到右的顺序计算;
(3)根据减法的性质简算;
(4)先算除法,再根据加法交换律简算.
解答:解:(1)360-225÷15×18,
=360-15×18,
=360-270,
=90;
(2)
÷
×
,
=
×
,
=
;
(3)4.72-1.16-2.84,
=4.72-(1.16+2.84),
=4.72-4,
=0.72;
(4)
+
÷
+
,
=
+
+
,
=
+
+
,
=1+
,
=1
.
=360-15×18,
=360-270,
=90;
(2)
3 |
5 |
5 |
6 |
8 |
15 |
=
18 |
25 |
8 |
15 |
=
48 |
125 |
(3)4.72-1.16-2.84,
=4.72-(1.16+2.84),
=4.72-4,
=0.72;
(4)
1 |
9 |
1 |
8 |
3 |
4 |
8 |
9 |
=
1 |
9 |
1 |
6 |
8 |
9 |
=
1 |
9 |
8 |
9 |
1 |
6 |
=1+
1 |
6 |
=1
1 |
6 |
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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