①0.25×32×0.125
②1.69-0.47+0.31-0.53
③0.84÷0.07-0.32÷0.16
④7.53×3.8+0.38×24.7
⑤4.26×101-4.26
⑥4.2-[(2.85-1.05)÷0.6]