84×[10.8÷(48.6+5.4)-0.2][(514-4.25)×58]÷38+3.3÷1562014×(3.4×69+3.5)3.5×69-3.41-3+5-7+9-11+13-…-39+41729×38+629×712+329×79121+2022121+50505212121+131313-数学
=
5 |
3 |
4 |
5 |
=3
7 |
15 |
(3)
2014×(3.4×69+3.5) |
3.5×69-3.4 |
=
2014×(3.4×69+3.5) |
(3.4+0.1)×69-3.4 |
=
2014×(3.4×69+3.5) |
3.4×69+3.5 |
=2014;
(4)1-3+5-7+9-11+13-…-39+41,
=(1-3)+(5-7)+(9-11)+…+(37-39)+41,
=41-2-2-2-…-2,
=41-2×10,
=41-20,
=21;
(5)
7 |
29 |
3 |
8 |
6 |
29 |
7 |
12 |
3 |
29 |
7 |
9 |
=
7 |
29 |
3 |
8 |
7 |
29 |
1 |
2 |
7 |
29 |
1 |
3 |
=
7 |
29 |
3 |
8 |
1 |
2 |
1 |
3 |
=
7 |
29 |
29 |
24 |
=
7 |
24 |
(6)
1 |
21 |
202 |
2121 |
50505 |
212121 |
13131313 |
21212121 |
=
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