-4,1,-2,2.5,-0.5,1.5,
25+85= 73.9-39.6= = =
18÷6= 798+205≈ 632÷69≈ 803-207≈
①
②
③
④8:12=x:4
⑤0.4:x=1.2:2
⑥x:10=