519.2÷(24.3×2-4.6) 和 0.7÷[(六分之五减去四分之一)×24]简便计算.
问题描述:
519.2÷(24.3×2-4.6) 和 0.7÷[(六分之五减去四分之一)×24]简便计算.
答
519.2÷(24.3×2-4.6)
=5192/10÷(243/10×2-46/10)
=5192/10÷(486/10-46/10)
=5192/10÷440/10
=5192/10×10/440
=5192/440
=118/10
= 11.8
0.7÷[(5/6-1/4)×24]
=7/10÷[7/12×24]
=7/10÷14
=7/10×1/14
=1/20