题目

解方程。①x+ = ②x÷ = ③ x= ④ -x= ⑤ x= ⑥x÷ = 答案：①x+15=710 解：x=710-15 x=710-210 x=12②x÷34=710解：x=710×34 x=2140③157x=37 解：x=37÷157 x=37×715 x=15④15-x=130解： x=15-130 x=16⑤85x=43解：x=43÷85 x=43×58x=56⑥x÷25=25 解：x=25×25 x=425 －Nice day, isn't it? －Yes．A little bit chilly ________ [　　] A． yet B． still C． though D． actually