×75%+× 50%+0.5+ 5×7×()
x:=0.5: = 0.2x-1.5=
3.75:x=3:12 (x-0.6)× =2.25 25%: =x:
7.8÷0.2=
×2-3.5=
12×(-)=
-+=
4×(1-10%)=
-62.5%=
+50%=
÷+×2=
×(+)÷ 37×60%+×37+37 ÷[(+)×]
×(25×32)×