简便计算 (1) 58.26-13.6-6.4+17.4 (2) 564+298
问题描述:
简便计算 (1) 58.26-13.6-6.4+17.4 (2) 564+298
(3)十一分之五×[(二分之五+三分之一)÷六分之五]
要详细写出解题过程,必须是“简便计算”
答
1 58.26-13.6-6.4+17.4
=(58.26+17.4)-(13.6+6.4)
=75.66-20
=55.66
2 564-298=564-300+2=264+2=266第三题呢? = =3 5/11×[(5/2+1/3)÷5/6]=5/11×[5/2×6/5+1/3×6/5]=5/11×[3+2/5]=5/11×17/5=17/11