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递等式计算(能简算的要简算)

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递等式计算(能简算的要简算)
(8.5-4)×(0.32÷1.6)
90.7×99+90.7
9
20
(1)(8.5-4)×(0.32÷1.6),
=4.5×0.2,
=0.9;
(2)90.7×99+90.7,
=90.7×(99+1),
=90.7×100,
=9070;
(3)
9
20÷[
1
2×(
2
5+
4
5)],
=
9
20÷[
1

6
5],
=
9
20÷
3
5,
=
9
20×
5
3,
=
3
4;
(4)
13
18÷(
5
6+
2

3
8),
=
13
18÷(
5
6+
1
4),
=
13
18÷
13
12,
=
13
18×
12
13,
=
2
3.