①1408﹣716﹣327
②4.37×99+4.37
③
④
1÷= ×= += -=
0.4÷0.2= 1÷= 406﹣299= a﹣a×0=
①12.5×3.2×2.5
②
③2023×
④ ÷[2﹣( )]
1.25×32×0.25
× +15×0.375+0.4×37.5%
÷ ×(1﹣ )