(1)762-357+438-243(2)(34+16-512)÷136(3)(200.6×365+2006×63.5)×40%(4)415×5+3247÷4+0.25×124(5)(0.5+14+318÷1.25)÷(514-1.25×135)(6)23+215+235+…+2399.-数学
1 |
4 |
=4×5+
1 |
5 |
1 |
4 |
4 |
7 |
1 |
4 |
=20+1+8+
1 |
7 |
=(20+1+8+31)+
1 |
7 |
=60+
1 |
7 |
=60
1 |
7 |
(5)(0.5+
1 |
4 |
1 |
8 |
1 |
4 |
3 |
5 |
=(0.5+
1 |
4 |
1 |
4 |
=(0.5+2.5+
1 |
4 |
1 |
4 |
=(3+
1 |
4 |
1 |
4 |
=3
1 |
4 |
1 |
4 |
=1;
(6)
2 |
3 |
2 |
15 |
2 |
35 |
2 |
399 |
=(1-
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
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