问题 解答题
用递等式计算.
848-800÷16×12
12.48-0.7×(5.12÷0.8)
8
9
×[
3
4
-(
7
16
-
1
4
)]
答案

(1)848-800÷16×12,

=848-50×12,

=848-600,

=248;

(2)12.48-0.7×(5.12÷0.8),

=12.48-0.7×6.4,

=12.48-4.48,

=8;

(3)

8
9
×[
3
4
-(
7
16
-
1
4
)],

=

8
9
×[
3
4
-
3
16
],

=

8
9
×
9
16

=

1
2

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