题目内容
计算下列各题,能用简便方法的用简便方法计算:
(1)
×(
-
)
(2)
×
+
×
(3)15×
÷
÷35
(4)97×
+
+
×2.
(1)
| 9 |
| 13 |
| 2 |
| 3 |
| 1 |
| 9 |
(2)
| 3 |
| 4 |
| 2 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
(3)15×
| 7 |
| 8 |
| 7 |
| 8 |
(4)97×
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
(1)
×(
-
),
=
×
-
×
,
=
-
,
=
;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)15×
÷
÷35,
=15×
×
×
,
=
;
(4)97×
+
+
×2,
=(97+l+2)×
,
=100×
,
=70;
| 9 |
| 13 |
| 2 |
| 3 |
| 1 |
| 9 |
=
| 9 |
| 13 |
| 2 |
| 3 |
| 9 |
| 13 |
| 1 |
| 9 |
=
| 6 |
| 13 |
| 1 |
| 13 |
=
| 5 |
| 13 |
(2)
| 3 |
| 4 |
| 2 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 7 |
=1×
| 2 |
| 7 |
=
| 2 |
| 7 |
(3)15×
| 7 |
| 8 |
| 7 |
| 8 |
=15×
| 7 |
| 8 |
| 8 |
| 7 |
| 1 |
| 35 |
=
| 3 |
| 7 |
(4)97×
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
=(97+l+2)×
| 7 |
| 10 |
=100×
| 7 |
| 10 |
=70;
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