20-19+18-17+16的简算

章琳绍260920 - 19+18 - 17···+4 - 3+2 - 1用简便方法计算,怎么做 -
能保杭19897899671 ______[答案] 20-19+18-17+...+4-3+2-1 =(20-19)+(18-17)+...+(4-3)+(2-1) =1*(20/2) =1*10 =10 希望对你有帮助,满意请及时采纳, 你的采纳是我回答的动力!

章琳绍260920 - 19+18 - 17...+4 - 3+2 - 1简便算法
能保杭19897899671 ______ 原式=(20-19)+(18-17)+······+(2-1)=10*1=10

章琳绍260920 - 19+18 - 17+16 - 15+…+2 - 1=______. -
能保杭19897899671 ______[答案] 20-19+18-17+16-15+…+2-1 =(20-19)+(18-17)+(16-15)+…+(2-1) =1+1+1+…+1 =10 故答案为:10.

章琳绍260920+19 - 18 - 17+16+15 - 14 - 13+12+11 - 10 - 9的简便运算 -
能保杭19897899671 ______ 展开全部20+19-18-17+16+15-14-13+12+11-10-9的简便运算20+19-18-17+16+15-14-13+12+11-10-9=(20-18)+(19-17)+(16-14)+(15-13)+(12-10)+(11-9)=2+2+2+2+2+2=12

章琳绍260920 - 19+18 - 17+16 - 15+14 - 13+12 - 11+10 - 9+8 - 7+6 - 5+4 - 3+2 - 1=?用简便方法计算 -
能保杭19897899671 ______[答案] (20-19)+(18-17)+(16-15)+(14-13)+(12-11)+(10-9)+(8-7)+(6-5)+(4-3)+(2-1)=10

章琳绍260920 - 19+18 - 17···+4 - 3+2 - 1用简便方法计算, -
能保杭19897899671 ______[答案] 20-19+18-17+...+4-3+2-1 =(20-19)+(18-17)+...+(4-3)+(2-1) =1*(20/2) =1*10 =10 ^_^

章琳绍2609计算:20+19 - 18 - 17+16+15 - 14 - 13+…+4+3 - 2 - 1. -
能保杭19897899671 ______[答案] 20+19-18-17+16+15-14-13+…+4+3-2-1, =(20-18)+(19-17)+(16-14)+…+(4-2)+(3-1), =2+2+2+2+2+2+2+2+2+2, =2*10, =20.

章琳绍260920+19 - 18+17 - 16+15 - 14这题怎么做要算式(简便算法) -
能保杭19897899671 ______[答案] 20+19-18+17-16+15-14 =20+(19-18)+(17-16)+(15-14) =20+1+1+1 =23

章琳绍260920+19 - 18 - 17+16+15 - 14 - 13+12+11 - 10 - 9+8+7 - 6 - 5+4+3 - 2 - 1的简便算法 -
能保杭19897899671 ______[答案] 20+(19-18)-(17-16)+(15-14)-(13-12)+(11-10)-(9-8)+(7-6)-(5-4)+(3-2)-(2-1)=20+1-1+1-1+1-1+1-1+1-1=20

章琳绍260920+19 - 18 - 17+16+15 - 14+13+12+11 - 10 - 9简便计算 -
能保杭19897899671 ______[答案] 20+19-18-17+16+15-14+13+12+11-10-9 =(20+19-18-17)+(16+15-14+13)+(12+11-10-9) =(20-18+19-17)+(16-14+15+13)+(12-10+11-9) =(2+2)+(2+2)+(2+2) =4+4+4 =12