1-0.25= 2.7+8.4= 4.9×1000=
3.06÷1000= 12.5÷10= 1.1×0.4=
①21.7+2.86=
②16.05-9.7=
③1.4×0.58=
④0.65×26=
⑤1.08×7.5=
⑥720×0.45=