①6x=18
②x:0.4=10:
③x﹣60%x=2
④=
4x﹣3×0.7=6.3
x+x=42 1.2:=9:x ×+40%x=1.2
①2x﹣x=4.2 ②:0.75=x:
①x+0.4÷=60 ②
-2.4x= 2.5:(5+2x)=:(x-1.2) =
①0.4x=3.6
②x﹣x=70
③1.6:x=0.8:0.4
①285-285÷19
②67.6÷13+0.8
③ × ÷ +
④( + )÷
⑤8.8×125
⑥ ×[ -( - )]
⑦4.5x-2.5=20
⑧x- x=
⑨x: =12:0.4