①(20+52)÷3﹣18
②(1.5﹣0.6)×(2﹣1.8)
③()×48
④2023×0.2+2023×80%
0.6+7.91+3.4+0.09 ×3+×8-
①8.06+12.34×0.6
②12-4.83+2.17
③
④4.8÷[(8.4÷7-0.6)×0.2]