题目内容
下面各题怎样算简便就怎样算.
①1.89+3.6+6.4+0.11
②
-
×
-
③1.2×99+1.2
④[
-(
-
)]×
.
①1.89+3.6+6.4+0.11
②
| 5 |
| 3 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
③1.2×99+1.2
④[
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 10 |
| 8 |
| 11 |
①1.89+3.6+6.4+0.11,
=(1.89+0.11)+(3.6+6.4),
=2+10,
=12;
②
-
×
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
③1.2×99+1.2,
=(99+1)×1.2,
=100×1.2,
=120;
④[
-(
-
)]×
,
=[
-(
-
)]×
,
=[
-
]×
,
=
×
,
=
.
=(1.89+0.11)+(3.6+6.4),
=2+10,
=12;
②
| 5 |
| 3 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
=
| 5 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 3 |
=
| 2 |
| 3 |
③1.2×99+1.2,
=(99+1)×1.2,
=100×1.2,
=120;
④[
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 10 |
| 8 |
| 11 |
=[
| 3 |
| 4 |
| 8 |
| 10 |
| 3 |
| 10 |
| 8 |
| 11 |
=[
| 3 |
| 4 |
| 1 |
| 2 |
| 8 |
| 11 |
=
| 1 |
| 4 |
| 8 |
| 11 |
=
| 2 |
| 11 |
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