5x-3.5x=0.9
x=
8×5+2.5x=60 x=
一副羽毛球拍的价钱是38元.小敏买了一副羽毛球拍和2个羽毛球,一共用了40元,一个羽毛球?
① =
②x+ =
③x+ =39
④x - =
⑤x÷ =
⑥ × =
①x: = :4
② =
③ x+ ×45=12
④7.5:x=2.5:12
⑤ : =x:1.8
⑥20%: =25%:x