题目内容
(2008?江都市)
| 递等式计算(能简算的要简算) (8.5-4)×(0.32÷1.6) |
90.7×99+90.7 |
|
|
分析:算式(1)(4)根据四则混合运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
算式(2)(3)根据乘法分配律进行计算即可.
算式(2)(3)根据乘法分配律进行计算即可.
解答:解:(1)(8.5-4)×(0.32÷1.6)
=4.5×0.2,
=0.9;
(2)90.7×99+90.7
=(99+1)×90.7,
=100×90.7,
=9070;
(3)
×9-6÷
=
×9-6×
,
=(9-6)×
,
=3×
,
=
;
(4)
÷(
+
×
)
=
÷(
+
),
=
÷(
+
),
=
×
,
=
.
=4.5×0.2,
=0.9;
(2)90.7×99+90.7
=(99+1)×90.7,
=100×90.7,
=9070;
(3)
| 7 |
| 15 |
| 15 |
| 7 |
=
| 7 |
| 15 |
| 7 |
| 15 |
=(9-6)×
| 7 |
| 15 |
=3×
| 7 |
| 15 |
=
| 7 |
| 5 |
(4)
| 13 |
| 18 |
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 8 |
=
| 13 |
| 18 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 13 |
| 18 |
| 10 |
| 12 |
| 3 |
| 12 |
=
| 13 |
| 18 |
| 12 |
| 13 |
=
| 2 |
| 3 |
点评:完成有关于分数的四则混合运算时要细心,注意通分约分.
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