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下列各题能简算的要简算.

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下列各题能简算的要简算.
3.1+2.4+1.9+3.6 300-288÷24 48×(
3
8
(1)3.1+2.4+1.9+3.6,
=(3.1+1.9)+(2.4+3.6),
=5+6,
=11;
(2)300-288÷24,
=300-12,
=288;
(3)48×(
3
8+
5
6),
=48×
3
8+48×
5
6,
=18+40,
=58;
(4)0.46×98+0.92,
=0.46×(100-2)+0.92,
=0.46×100-0.46×2+0.92,
=46-0.92+0.92,
=46;
(5)
4

2

4

2
5,
=(
4

4
5)×(
2

2
5),
=1×0.16,
=0.16;
(6)21÷(
1
3+
2
5)÷
9
11,
=21÷
11
15÷
9
11,
=21÷(
11
15×
9
11),
=21÷
3
5,
=35.