3.14×4= 1.5×1.5=
1÷0.1= 0.52=
9÷ ×6= 7.8+3.22=
4:0.5= 25×4÷25×4=
7.8÷0.2=
×2-3.5=
12×(-)=
-+=
4×(1-10%)=
-62.5%=
+50%=
÷+×2=
= x:32=:21 70%:x=1.2:0.6
①x∶18=4∶24
②=
③38∶20=76∶x
④=
⑤∶x=∶
⑥x∶=8∶
①59×101=
②24×( + - )
③12.5×8÷12.5×8
④2.5÷ ×
⑤12.6-3.6-5.4
⑥0.5× +50%× + ×