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(2014•邵阳)计算下面各题,能简算的要用简便方法计算.

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(2014•邵阳)计算下面各题,能简算的要用简便方法计算.
(1)50-0.45-9.55
(2)1.25×0.25×0.8×4
(3)
4
17
(1)50-0.45-9.55
=50-(0.45+9.55)
=50-10
=40;

(2)1.25×0.25×0.8×4
=(1.25×0.8)×(0.25×4)
=1×1
=1;

(3)
4
17×
3
5+
13
17÷
5
3
=
4
17×
3
5+
13
17×
3
5
=(
4
17+
13
17)×
3
5
=1×
3
5
=
3
5;

(4)1650-480÷16×15
=1650-30×15
=1650-450
=1200;

(5)(8.42-7.5)÷0.23×2.7
=0.92÷0.23×2.7
=4×2.7
=10.8;

(6)(
2
3+
7

9
28)÷
11
12
=(
2
3+
1
4)÷
11
12
=
11
12÷
11
12
=1.