用简便方法计算下面各题.25+38+5810-15-45518-(518-725)917+(512+817)49+116+1516+591625-(1419-925)-数学
4 |
5 |
=10-1,
=9;
(3)
5 |
18 |
5 |
18 |
7 |
25 |
=(
5 |
18 |
5 |
18 |
7 |
25 |
=
7 |
25 |
(4)
9 |
17 |
5 |
12 |
8 |
17 |
=(
9 |
17 |
8 |
17 |
5 |
12 |
=1+
5 |
12 |
=1
5 |
12 |
(5)
4 |
9 |
1 |
16 |
15 |
16 |
5 |
9 |
=(
4 |
9 |
5 |
9 |
1 |
16 |
15 |
16 |
=1+1,
=2;
(6)
16 |
25 |
14 |
19 |
9 |
25 |
=
16 |
25 |
14 |
19 |
9 |
25 |
=(
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