7.2:x=
解:3.6x=57.6
3.6x÷3.6=57.6÷3.6
x=16
0.54×50+2x=32 6.8﹣0.8x=2.8 4:x=:34
7.2x﹣5.4x=25.2 13x+17=108 =
:x=:5 8x﹣5.1x=2.9 (0.4+x)×3=2.7
① ②
①1.5x-2.8=4.7
②
③12: =
①
③ =3:2