题目内容
计算下面各题,能简便计算的要简便计算
10.15-6.25-3.75+7.85
6.48÷[(3.3-2.7)×0.9
×(
+1÷
)
×
+
÷8.
10.15-6.25-3.75+7.85
6.48÷[(3.3-2.7)×0.9
| 10 |
| 13 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8 |
| 13 |
| 9 |
| 13 |
| 9 |
分析:(1)10.15-6.25-3.75+7.85,运用加法交换律、结合律和减法的运算性质进行简算;
(2)6.48÷[(3.3-2.7)×0.9],按照小数四则混合运算的运算顺序和小数四则运算的计算法则进行计算;
(3)
×(
+1÷
),按照分数四则混合运算的运算顺序和四则运算的计算法则进行计算;
(4)
×
+
÷8,把除数转化为乘它的倒数,再意义乘法分配律进行简算.
(2)6.48÷[(3.3-2.7)×0.9],按照小数四则混合运算的运算顺序和小数四则运算的计算法则进行计算;
(3)
| 10 |
| 13 |
| 3 |
| 4 |
| 5 |
| 6 |
(4)
| 7 |
| 8 |
| 13 |
| 9 |
| 13 |
| 9 |
解答:解:(1)10.15-6.25-3.75+7.85,
=10.15+7.85-(6.25+3.75),
=18-10,
=8;
(2)6.48÷[(3.3-2.7)×0.9],
=6.48÷[0.6×0.9],
=6.48÷0.54,
=12;
(3)
×(
+1÷
),
=
×(
+1×
),
=
×
,
=
,
=1
;
(4)
×
+
÷8,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=10.15+7.85-(6.25+3.75),
=18-10,
=8;
(2)6.48÷[(3.3-2.7)×0.9],
=6.48÷[0.6×0.9],
=6.48÷0.54,
=12;
(3)
| 10 |
| 13 |
| 3 |
| 4 |
| 5 |
| 6 |
=
| 10 |
| 13 |
| 3 |
| 4 |
| 6 |
| 5 |
=
| 10 |
| 13 |
| 39 |
| 20 |
=
| 3 |
| 2 |
=1
| 1 |
| 2 |
(4)
| 7 |
| 8 |
| 13 |
| 9 |
| 13 |
| 9 |
=
| 7 |
| 8 |
| 13 |
| 9 |
| 13 |
| 9 |
| 1 |
| 8 |
=(
| 7 |
| 8 |
| 1 |
| 8 |
| 13 |
| 9 |
=1×
| 13 |
| 9 |
=
| 13 |
| 9 |
点评:此题主要考查小数、分数四则混合运算,完成本题要注意分析式中数据,运用合适的简便方法计算.
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