①x:12= :
②3x- =
③ x+ x=9
⑴0.25(7x-0.2)=1.2 ⑵
⑶ ⑷(3x-0.5):(4x+3)=4:9
①5x﹣
②
③5x﹣14×0.5=56
④24:=32:x
0.8x+0.7=7.9 :x=0.6:
① = :30%
②x﹣x﹣ =1
4+0.7x=102 3x﹣x=10 x:=21: