(125十16)X8 57X99十57 49十93X7 92X8十64 81十9X91怎简便计算

(125+16)×8
=125×8+16×8
=1000+128
=112857×99+57 =57×(99+1) =57×100 =570049+93×7 =7×7+93×7 =7×(93+7) =7×100 =70092×8+64 =92×8+8×8 =8×(92+8) =8×100 =80081+9×91 =9×9+9×91 =9×(9+91) =9×100 =900请采纳哦～O(∩_∩)O