Contact us
Choose a category below so we can get back to you as quickly as possible.
12÷3=4(噸),水泥:4×2=8(噸),12-8=4(噸);石子:4×5=20(噸),20-12=8(噸);答:水泥剩4噸,石子缺8噸.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.