题目内容
| 计算下面各题,能简算的要简算. |
| 98×
| 42×(
| ||||||||||||||
7×9(
|
|
|
(1)
×
×75,
=
×75×
,
=
;
(2)98×
,
=(97+1)×
,
=97×
+1×
,
=1+
,
=1
;
(3)42×(
-
),
=42×
-42×
,
=57-16,
=41;
(4)7×9×(
-
),
=7×9×
-7×9×
,
=54-7,
=47;
(5)
×99+
,
=
×(99+1),
=
×100,
=70;
(6)
×
+
,
=
+
,
=
.
| 1 |
| 75 |
| 7 |
| 18 |
=
| 1 |
| 75 |
| 7 |
| 18 |
=
| 7 |
| 18 |
(2)98×
| 96 |
| 97 |
=(97+1)×
| 96 |
| 97 |
=97×
| 96 |
| 97 |
| 96 |
| 97 |
=1+
| 96 |
| 97 |
=1
| 96 |
| 97 |
(3)42×(
| 19 |
| 14 |
| 8 |
| 21 |
=42×
| 19 |
| 14 |
| 8 |
| 21 |
=57-16,
=41;
(4)7×9×(
| 6 |
| 7 |
| 1 |
| 9 |
=7×9×
| 6 |
| 7 |
| 1 |
| 9 |
=54-7,
=47;
(5)
| 7 |
| 10 |
| 7 |
| 10 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
=70;
(6)
| 4 |
| 9 |
| 3 |
| 16 |
| 5 |
| 12 |
=
| 1 |
| 12 |
| 5 |
| 12 |
=
| 1 |
| 2 |
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