=40: = ÷40= %= (填小数)
× =× =0.5× =+ =1﹣ .
+= ++= .
2吨水泥增加吨是 吨,增加它的是 吨.
4个相加,可以写成+++,也可以×4. .
8吨的和4吨的相等. .(判断对错)