4:1.25=x:0.75
80×40%=
+25%=
20÷50%=
-12.5%=
35%×40=
160%-1.2=
198+236=
÷0.4=
16×=
+×=
3.02-0.2=
0.32=
63÷=
×÷×=
①x+18=48
②
③x-0.2x=5.6
60%x+12×45%=7.8