1.2:7.5=0.4:x
x+7%x=5.35 (1-60%)x=5.6
3.9x÷(1+30%)=50 3x+60%x=12
48-25%x=32 4%x-6=0.4
1.5∶12=6∶x 18∶4=9∶x
∶=0.25∶x = =
①x÷25%=4
②
③4x﹣2.4x=1.6