+×+ 7.5×+2.5÷
2.4×(1.01-0.88)÷0.52 1.2+〔(0.5-)×1.8〕
78×12−12×38 38×0.6÷34−23 5×13−15÷512
[1-(16+38)]÷16 2÷85×2524 (8.9-7.7)÷0.2×0.15
①0.96×516÷15 ②49÷4+4÷49 ③2019×20192020
④1784×13+1384×25 ⑤(320+2.1)×47÷0.9 ⑥0.5+156÷(0.75+1920)