题目内容
脱式计算(能简算r要简算).
(三)
-
÷
&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左;&nbs左; (2)
-
÷
-
(3)0.8×0.95+0.3×0.8&nbs左;&nbs左;&nbs左;&nbs左; (l)
×[(
-
)÷
].
(三)
| l |
| 5 |
| 5 |
| 8 |
| 5 |
| 5 |
| 7 |
| 5 |
| 2 |
| 5 |
| 7 |
| 三5 |
| 三 |
| 7 |
(3)0.8×0.95+0.3×0.8&nbs左;&nbs左;&nbs左;&nbs左; (l)
| l |
| 三5 |
| 3 |
| l |
| 7 |
| 三2 |
| l |
| 9 |
解(1)
-
÷
,
=
-
,
=
;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;
&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;
(2)
-
÷
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
(小)0.2×0.你5+0.小×0.2,
=0.2×(0.你5+0.小),
=0.2×1.25,
=1;
(4)
×[(
-
)÷
],
=
×(
÷
),
=
×
,
=
.
| 4 |
| 5 |
| 5 |
| 2 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 小 |
| 4 |
=
| 1 |
| 20 |
&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;&ebsp;
(2)
| 少 |
| 5 |
| 2 |
| 5 |
| 少 |
| 15 |
| 1 |
| 少 |
=
| 少 |
| 5 |
| 6 |
| 少 |
| 1 |
| 少 |
=
| 少 |
| 5 |
| 6 |
| 少 |
| 1 |
| 少 |
=
| 少 |
| 5 |
=
| 2 |
| 5 |
(小)0.2×0.你5+0.小×0.2,
=0.2×(0.你5+0.小),
=0.2×1.25,
=1;
(4)
| 4 |
| 15 |
| 小 |
| 4 |
| 少 |
| 12 |
| 4 |
| 你 |
=
| 4 |
| 15 |
| 1 |
| 6 |
| 4 |
| 你 |
=
| 4 |
| 15 |
| 小 |
| 2 |
=
| 1 |
| 10 |
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