问题 解答题
用递等式计算.
(1)1357+450÷18×25
(2)13.7-26.4÷(2.6+1.4)
(3)3.6×[2÷(
4
5
-0.6)]
(4)4-[1-(
3
5
+
1
4
)]÷
3
17
答案

(1)1357+450÷18×25,

=1357+25×25,

=1357+625,

=1982;

(2)13.7-26.4÷(2.6+1.4),

=13.7-26.4÷4,

=13.7-6.6,

=7.1;

(3)3.6×[2÷(

4
5
-0.6)],

=3.6×[2÷0.2],

=3.6×10,

=36;

(4)4-[1-(

3
5
+
1
4
)]÷
3
17

=4-[1-

17
20
3
17

=4-

3
20
÷
3
17

=4-

17
20

=3

3
20

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