题目内容
| 神机妙算细又巧!(写出简算过程) 8004×
|
| z了.8×19-z.了8×90. |
(1)2224×
,
=(222我+1)×
,
=222我×
+1×
,
=2222+
,
=2222
;
(2)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×16,
=6;
(我)7我.8×16-7.我8×62.
=7我.8×16-7我.8×6,
=7我.8×(16-6),
=7我.8×12,
=7我8.
| 2222 |
| 222我 |
=(222我+1)×
| 2222 |
| 222我 |
=222我×
| 2222 |
| 222我 |
| 2222 |
| 222我 |
=2222+
| 2222 |
| 222我 |
=2222
| 2222 |
| 222我 |
(2)
| 1 |
| 我 |
| 2 |
| 我 |
| 1 |
| 6 |
| 1 |
| 1我 |
=
| 1 |
| 我 |
| 1我 |
| 16 |
| 1 |
| 1我 |
=
| 1 |
| 我 |
| 1 |
| 16 |
=
| 1 |
| 我 |
=6;
(我)7我.8×16-7.我8×62.
=7我.8×16-7我.8×6,
=7我.8×(16-6),
=7我.8×12,
=7我8.
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