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(2008•高邮市模拟)计算下面各题(可简便计算的应简便计算).

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(2008•高邮市模拟)计算下面各题(可简便计算的应简便计算).
(1)3.87+1.44-0.87+0.56
(2)58.8÷2.1-1.6×3.5
(3)(
3
7
(2008•高邮市模拟)计算下面各题(可简便计算的应简便计算).
(1)3.87+1.44-0.87+0.56
=(3.87-0.87)+(1.44+0.56),
=3+2,
=5;

(2)58.8÷2.1-1.6×3.5
=28-5.6,
=22.4;

(3)(
3
7+
1
3)×21
=
3
7×21+
1
3×21,
=9+7,
=16;

(4)5.16×8.5+1.5×5.16
=(8.5+1.5)×5.16,
=10×5.16,
=51.6;

(5)
3
10×(
1
2+
1
3)÷
1
8
=
3
10×(
3
6+
2
6)×8,
=
3
10×
5
6×8,
=2;

(6)
3
8×[
8
9÷(
5
6-
3
4)]
=
3
8×[
8
9÷(
10
12-
9
12)],
=
3

8
9×12,
=4.