1. 计算:22310(1);57abbac22321(2);410aba bxyx y222(3)3;(3 )xxyy212(3)4() .5xyxy223102577ababacbc223105=42114abx yxxya ba222322(3 )3xyxxy21235 4()5xyxyxy2. 计算:2224(1);21xxxx2(22) (4)(2) (1)2(1) (2)(2)(2) (1)2(2)xxxxxxxxxx22(2)(2).xyxxyyxy22222() (2)() ()1xyxyxxyyxyxyxyxy3. 计算:326(1)();bb cac 326633634()()1bb cacba cb ca c 3224(2)() .xyxyyx2644232623445()1=xyx yyxxyyxx yx4. 体育课上,李明和王亮进行单人定位投篮练习 . 李明投 a 次中 b 次,王亮投 m 次中 n 次,问李明投篮的命中率是王亮的几倍?bnb mbmamananbman答:李明投篮的命中率是王亮的倍.