①=
②=
③5×10%=
④2.51﹣1.9=
⑤3.14×32=
⑥=
⑦=
⑧=
⑨1+2.5=
⑩=
x∶(1-40%)=24∶3
③ ④25∶7=x∶1.4
⑤∶x=∶ ⑥(x-2)∶4=5∶2