简便计算(1) 5.23÷4-3.23×0.25 (2) 4.2×6.5÷1.3_数学解答

简便计算(1) 5.23÷4-3.23×0.25 (2) 4.2×6.5÷1.3

人气：309 ℃　时间：2020-05-09 15:57:09

解答

(1) 5.23÷4-3.23×0.25
=5.23×0.25-3.23×0.25
=(5.23-3.23)×0.25
=2×0.25
=0.5
(2) 4.2×6.5÷1.3
=4.2×5×1.3÷1.3
=4.2×5
=21