1800-799= ×0= 354+147≈
10-10%= 3.6 +1.8= ×5.6= 723÷89≈
2÷= 12.3+7 = 0.23= 0.125×17×8=
①﹣(+)
②8.89﹣1.84﹣3.16
③÷9+×
④12.5×0.32×2.5