题目内容
0.25×
|
| 99×
|
(1)0.25×
×0.4×8
=(0.25×0.4)×(
×8)
=0.1×3
=0.3;
(2)
×
+
÷
=
×
+
×
=(
+
)×
=
×
=
;
(3)99×
=(98+1)×
=98×
+
=97+
=97
.
| 3 |
| 8 |
=(0.25×0.4)×(
| 3 |
| 8 |
=0.1×3
=0.3;
(2)
| 2 |
| 5 |
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 7 |
=
| 2 |
| 5 |
| 7 |
| 8 |
| 3 |
| 8 |
| 7 |
| 8 |
=(
| 2 |
| 5 |
| 3 |
| 8 |
| 7 |
| 8 |
=
| 31 |
| 40 |
| 7 |
| 8 |
=
| 217 |
| 320 |
(3)99×
| 97 |
| 98 |
=(98+1)×
| 97 |
| 98 |
=98×
| 97 |
| 98 |
| 97 |
| 98 |
=97+
| 97 |
| 98 |
=97
| 97 |
| 98 |
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