题目内容
下面各题,怎样算简便就怎样算:
(1)1.8+2.7+3.2+2.3
(2)9×
+9×
(3)1-
÷
(4)[1-(
+
)]÷
.
(1)1.8+2.7+3.2+2.3
(2)9×
| 3 |
| 5 |
| 2 |
| 5 |
(3)1-
| 7 |
| 9 |
| 7 |
| 8 |
(4)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
(1)1.8+2.7+3.2+2.3,
=(1.8+3.2)+(2.7+2.3),
=5+5,
=10;
(2)9×
+9×
,
=9×(
+
),
=9×1,
=9;
(3)1-
÷
,
=1-
×
,
=1-
,
=
;
(4)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
×4,
=
,
=1
.
=(1.8+3.2)+(2.7+2.3),
=5+5,
=10;
(2)9×
| 3 |
| 5 |
| 2 |
| 5 |
=9×(
| 3 |
| 5 |
| 2 |
| 5 |
=9×1,
=9;
(3)1-
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 7 |
| 9 |
| 8 |
| 7 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
(4)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
=
| 3 |
| 2 |
=1
| 1 |
| 2 |
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