x
3
y
40
120
① ② ③
75:15=x:14 4:x=3.25:6.5 x:0.36=15:6
x:10=6:5 = 0.4:3.2=x:9.6
x:0.25=4:5.5
5:0.4=6:x
x:3. 5=3 :4 := :x
= x∶3.25=∶
2x+30%x=13.8 13:x=6.5:4
:x=: 2:=3.6:x 12-4x=2.4