题目内容
递等式计算
6.4+3.6×5.2 |
|
|
308÷(191-189) |
分析:(1)先算乘法,再算加法;
(2)通分计算;
(3)(4)先算括号内的,再算括号外的.
(2)通分计算;
(3)(4)先算括号内的,再算括号外的.
解答:解:(1)6.4+3.6×5.2,
=6.4+18.72,
=25.12;
(2)
+
-
,
=
+
-
,
=
;
(3)
-(
+
),
=
-
,
=
;
(4)308÷(191-189),
=308÷2,
=154.
=6.4+18.72,
=25.12;
(2)
7 |
15 |
1 |
9 |
1 |
3 |
=
21 |
45 |
5 |
45 |
15 |
45 |
=
11 |
45 |
(3)
3 |
5 |
2 |
15 |
1 |
3 |
=
3 |
5 |
7 |
15 |
=
2 |
15 |
(4)308÷(191-189),
=308÷2,
=154.
点评:此题考查了整数、小数、分数的四则混合运算,注意运算顺序和运算法则,细心计算.
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递等式计算
6.4+3.6×5.2 | +- | -(+) | 308÷(191-189) |