简便计算 (1.9+19%)÷(0.29-190%)
问题描述:
简便计算 (1.9+19%)÷(0.29-190%)
答
(1.9+19%)÷(0.29-190%)
=(190/100+19/100)÷(29/100-190/100)
=209/100*(-100/161)
=-209/161