Help me please!°~°Pleasy :(

Question

Help me please!°~°
Pleasy :(

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Answer 1

8:（720:90）＝ 8:8＝1

360:40-9＝9-9＝0

（549-61·9）:27＝（549-549）:27＝0:27＝0

（175·5-875）·75＝（875-875）·75＝0·75＝0

240:（480:30-15）＝240:（16-15）＝240:1＝240

67·（40·100-399）＝67·（400-399）＝67·1＝67