题目内容
简便计算
(1)(
-
)×
+
×
(2)11.4×52%-1.4×0.52
(3)
×27+
×19
(4)
×6+9÷
-
.
(1)(
| 7 |
| 8 |
| 1 |
| 2 |
| 13 |
| 5 |
| 13 |
| 5 |
| 5 |
| 8 |
(2)11.4×52%-1.4×0.52
(3)
| 16 |
| 23 |
| 16 |
| 23 |
(4)
| 6 |
| 7 |
| 7 |
| 6 |
| 6 |
| 7 |
分析:(1)(3)运用乘法分配律简算;
(2)把52%化为小数,运用乘法分配律简算;
(4)把除法改为乘法,运用乘法分配律简算.
(2)把52%化为小数,运用乘法分配律简算;
(4)把除法改为乘法,运用乘法分配律简算.
解答:解:(1)(
-
)×
+
×
,
=(
-
+
)×
,
=1×
,
=
;
(2)11.4×52%-1.4×0.52,
=11.4×0.52-1.4×0.52,
=(11.4-1.4)×0.52,
=10×0.52,
=5.2;
(3)
×27+
×19,
=
×(27+19),
=
×46,
=32;
(4)
×6+9÷
-
,
=
×6+9×
-
,
=(6+9-1)×
,
=14×
,
=12.
| 7 |
| 8 |
| 1 |
| 2 |
| 13 |
| 5 |
| 13 |
| 5 |
| 5 |
| 8 |
=(
| 7 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
| 13 |
| 5 |
=1×
| 13 |
| 5 |
=
| 13 |
| 5 |
(2)11.4×52%-1.4×0.52,
=11.4×0.52-1.4×0.52,
=(11.4-1.4)×0.52,
=10×0.52,
=5.2;
(3)
| 16 |
| 23 |
| 16 |
| 23 |
=
| 16 |
| 23 |
=
| 16 |
| 23 |
=32;
(4)
| 6 |
| 7 |
| 7 |
| 6 |
| 6 |
| 7 |
=
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
=(6+9-1)×
| 6 |
| 7 |
=14×
| 6 |
| 7 |
=12.
点评:此题重点考查学生对乘法分配律的掌握与运用,同时注意灵活处理式中数据.
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