题目内容
97×
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分析:(1)把97看作96+1,运用乘法分配律简算;
(2)(3)运用乘法分配律简算;
(4)(6)把除法改为乘法,运用乘法分配律简算;
(5)中括号内运用乘法分配律简算,最后算括号外的除法.
(2)(3)运用乘法分配律简算;
(4)(6)把除法改为乘法,运用乘法分配律简算;
(5)中括号内运用乘法分配律简算,最后算括号外的除法.
解答:解:(1)97×
,
=(96+1)×
,
=96×
+1×
,
=5+
,
=5
;
(2)
×
+
×
,
=
×(
+
),
=
×
,
=
;
(3)
×18-7×
-
,
=
×(18-7-1),
=
×10,
=6;
(4)
×58+42÷8,
=
×58+42×
,
=
×(58+42),
=
×100,
=12.5;
(5)
÷[(
+
)×30],
=
÷[
×30+
×30],
=
÷[21+8],
=
÷29,
=
×
,
=
;
(6)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 5 |
| 96 |
=(96+1)×
| 5 |
| 96 |
=96×
| 5 |
| 96 |
| 5 |
| 96 |
=5+
| 5 |
| 96 |
=5
| 5 |
| 96 |
(2)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 2 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 2 |
(3)
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=6;
(4)
| 1 |
| 8 |
=
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=12.5;
(5)
| 1 |
| 2 |
| 7 |
| 10 |
| 4 |
| 15 |
=
| 1 |
| 2 |
| 7 |
| 10 |
| 4 |
| 15 |
=
| 1 |
| 2 |
=
| 1 |
| 2 |
=
| 1 |
| 2 |
| 1 |
| 29 |
=
| 1 |
| 58 |
(6)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:此题主要考查学生对乘法分配律的掌握与运用情况.
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