75930≈74万 192348000≈19亿
25×87<10000 82×<400
53069560593 564108000546108000 405×9090×450
82万820000 364009908837亿 18×30030×180
①20×(624÷52)
②26×20+96÷6
③484÷(32+12)×9
④12×[288÷(36-24)]
= ×
=
= ×22+3
=10+3
=13