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神机妙算细又巧!(写出简算过程)2004×20022003 (115+217)×15...
神机妙算细又巧!(写出简算过程)2004×20022003(115+217)×15×1713÷58+23÷581110?14?34+910....
神机妙算细又巧!(写出简算过程)2004×20022003 (115+217)×15×17 13÷58+23÷58 1110?14?34+910.
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(1)2004×
2002 |
2003 |
=
2004×2002 |
2003 |
=
(2003+1)×2002 |
2003 |
=
2003×2002+2002 |
2003 |
=2002+
2002 |
2003 |
=2002
2002 |
2003 |
(2)(
1 |
15 |
2 |
17 |
=
1 |
15 |
2 |
17 |
=17+30,
=47;
(3)
1 |
3 |
5 |
8 |
2 |
3 |
5 |
8 |
=
1 |
3 |
8 |
5 |
2 |
3 |
8 |
5 |
=(
1 |
3 |
2 |
3 |
8 |
5 |
=1×
8 |
5 |
=
8 |
5 |
(4)
11 |
10 |
1 |
4 |
3 |
4 |
9 |
10 |
=(
11 |
10 |
9 |
10 |
1 |
4 |
3 |
4 |
=2-1,
=1.
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