用递等式计算.(1)2180+540÷18×24(2)157×(5÷56-56÷5)(3)415÷[2.5-0.4×(245-1.05)](4)[1-(413-1.75×2)]÷212.-数学
题文
用递等式计算. (1)2180+540÷18×24 (2)1
(3)4
(4)[1-(4
|
答案
(1)2180+540÷18×24, =2180+30×24, =2180-720, =1460; (2)1
=1
=1
=
=10; (3)4
=4
=4
=4
=
=
(4)[1-(4
=[1-(4
|