脱式计算 456-45÷9 280×7-942 854÷(56-49)

2025-06-24 05:49:33
推荐回答(1个)
回答1:

(1)456-45÷9,
=456-5,
=451;
(2)280×7-942,
=1960-942,
=1018;
(3)854÷(56-49),
=854÷7,
=122;