某工厂四月份下半月用水5400吨,比上半月节约20%,上半月用水多少吨?5{3i*x+G3Y
解:
算式:提示9H/u)g9L'J+B*a2U:B5{3i*x+G3Y
答:上半月用水'~/v8V0N吨。5{3i*x+G3Y