①19×35+45×19 ②19×(35+45-19)+19×19 ③19×(35+45)
④(35+19)×45-35×(45-19) ⑤19×35+45×19-19×19
40×40◯160 540÷18◯540÷9×2
360万◯3600000 8×(21+56)◯8×21+56
0.48÷0.3= 36- = 2.5×40= ×(15+ )=
684+198= 12×1%= × = ×9÷ =