题目内容
(个011?田东县)用简便方法计算.
4×1.个8×个5&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;
÷
+
×
.
4×1.个8×个5&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;&nb7p;
| 7 |
| 左 |
| 11 |
| 5 |
| 个 |
| 左 |
| 5 |
| 11 |
(w)三×w.28×2三,
=三×2三×w.28,
=w00×w.28,
=w28;
(2)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=w×
,
=
.
=三×2三×w.28,
=w00×w.28,
=w28;
(2)
| 五 |
| o |
| ww |
| 三 |
| 2 |
| o |
| 三 |
| ww |
=
| 五 |
| o |
| 三 |
| ww |
| 2 |
| o |
| 三 |
| ww |
=(
| 五 |
| o |
| 2 |
| o |
| 三 |
| ww |
=w×
| 三 |
| ww |
=
| 三 |
| ww |
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