360÷40= 60÷20= 280÷40= 135-65= 20÷4×5=
480÷60= 180÷60= 42×20= 460÷20= 100-50÷5=
123÷49=
884÷68=
506÷48=
①132×24=
②756÷54=
★③350×26=
④850÷70=
⑤52×308=
★⑥973÷18=
53069560593 564108000546108000 405×9090×450
82万820000 364009908837亿 18×30030×180