①402+7590≈
②69×41≈
③81.35÷9≈
④5789-298≈
5.4÷0.09= 7.75+3.86-7.75+1.14= 2.5×0.99×0.4=
26.2+38= 40×0.1÷0.001= 56.27- 3.73-46.27=