①33×37+33×63
②360÷8+360÷12
③109×(560-560÷7)
④6300÷45
⑤51-13.67-16.33
⑥133×256+77×256-2560
75×43+75×57=75× 62×18-8×62=×
149-36-64=- 300÷25÷4=300÷
47×9+72×9=(□○□)○□
=4.3-4.3
=0