递等式计算 4620+(401-438÷73) 52×80-720÷9 (124-85)×12÷26.

问题描述:

递等式计算
4620+(401-438÷73)
52×80-720÷9 
(124-85)×12÷26.

(1)4620+(401-438÷73),
=4620+(401-6),
=4620+395,
=5015;
(2)52×80-720÷9,
=4160-80,
=4080;
(3)(124-85)×12÷26,
=39×12÷26,
=468÷26,
=18.