问题 解答题
用递等式计算.
(1)168.1÷(4.3×2-0.4)
(2)
4
9
×[
3
4
-(
7
16
-
1
4
)].
答案

(1)168.1÷(4.3×2-0.4),

=168.1÷(8.6-0.4),

=168.1÷8.2,

=20.5;

(2)

4
9
×[
3
4
-(
7
16
-
1
4
)],

=

4
9
×[
3
4
-
3
16
],

=

4
9
×
9
16

=

1
4

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