25%×99+25%
19.3-(9.3+4.55)
①10×10%=
②56%-28%=
③1+0.5% =
④1-0.5% =
⑤1÷1% =
⑥1-98% =
⑦3+150% =
⑧15%×75% =
③ ④25∶7=x∶1.4
⑤∶x=∶ ⑥(x-2)∶4=5∶2