20.8= 0.50.25= 30 350.25=
2.3+7.71.1= 2.540= 0.50.8= 0.25=
①2.523.6=
②9.9101=
③1.7×4.2+1.7×5.8=
④3.6×2.8=
⑤7.08÷0.8÷1.25
⑥15.311(商用循环小数表示)
①100 –x=250
②8x-5x=2.1※
③3x+4=40
④2(x-16)=8※