题目内容
简便计算
(九)6九-
-
(6)九6×(
-
)×6我
(3)
×
+
÷
-0.c.
(九)6九-
| 九九 |
| 九3 |
| 6 |
| 九3 |
(6)九6×(
| 5 |
| 6 |
| 5 |
| 9 |
(3)
| 3 |
| 九3 |
| 九 |
| 5 |
| 九0 |
| 九3 |
| 5 |
| 九 |
(1)21-
-
,
=21-(
+
)
=21-1,
=23;
(2)12×(
-
)×27,
=(12×
-12×
)×27,
=(10-
)×27
=10×27-
×27,
=270-180,
=90;
(3)
×
+
÷
-0.8,
=
×
+
×
-
,
=(
+
-1)×
,
=(1-1)×
,
=0×
,
=0.
| 11 |
| 13 |
| 2 |
| 13 |
=21-(
| 11 |
| 13 |
| 2 |
| 13 |
=21-1,
=23;
(2)12×(
| 5 |
| 6 |
| 5 |
| 9 |
=(12×
| 5 |
| 6 |
| 5 |
| 9 |
=(10-
| 20 |
| 3 |
=10×27-
| 20 |
| 3 |
=270-180,
=90;
(3)
| 3 |
| 13 |
| 1 |
| 5 |
| 10 |
| 13 |
| 5 |
| 1 |
=
| 3 |
| 13 |
| 1 |
| 5 |
| 10 |
| 13 |
| 1 |
| 5 |
| 1 |
| 5 |
=(
| 3 |
| 13 |
| 10 |
| 13 |
| 1 |
| 5 |
=(1-1)×
| 1 |
| 5 |
=0×
| 1 |
| 5 |
=0.
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