4/1*5+4/5*9+4/9*13+.+4/77*81

4/1*5+4/5*9+4/9*13+.+4/77*81

4/1*5+4/5*9+4/9*13+.+4/77*81
=1-1/5+1/5-1/9+1/9-1/13+…… +1/77-1/81
=1-1/81
=80/81

1,4,3,40, (d) a.80 b.81 c.120 d.1213/8,1,13 / 18, (b) a.17/8 b.9/4 c.19/8 d.5/2 can't think of it, thank you

1,4,3,40, (d) 1,1,0,1,1, 121 is a division of 3 and 1“

Calculate 33 degrees 52 points + 21 degrees 54 points=

33 degrees 52 points + 21 degrees 54 points
=54 degrees 106 minutes
=55 degrees 46 minutes

34 degrees 54 points + 21 degrees 33 points =, to process

The score is 60, 54 points + 33 points = 87 points = 1 degree 27 points. The front 34 degrees + 21 points = 55 degrees. The total is 56 degrees 27 points

(567+354*566)/(567*345+222)=?

567+345*566/567*345+222
=(345+345*566+222)/(567*345+222)
=(345*567+222)/(567*345+222)
=1

Calculation: 567 + 345 × 566567 × 345 + 222=______ ．

：567+345×566567×345+222，=567+345×566(566+1)×345+222，=567+345×566345×566+345+222，=567+345×566345×566+567，=567+345×566567+345×566，=1．

(567+345*566)/(567*345+222)+(876*655-321)/(555+876*654)

567 * 345 + 222 = (566 + 1) * 345 + 222 = 566 * 345 + 345 + 222 = 566 * 345 + 567, so (567 + 345 * 566) / (567 * 345 + 222) = 1, same as 655 + 876 * 654 = 655 + 876 * (655-1) = 876 * 655-321, so (876 * 655-321) / (555 + 876 * 654) = 1, so = 1 + 1 = 2

(567+345*566)*(567*345+222)

(567+345*566)*(567*345+222)
=[567+345*(567-1)]*(567*345+222)
=(567+345*567-345)*(567*345+222)
=(567*345+222)*(567*345+222)
=(567*345+222)^2
=195837^2
=38352130569

How to calculate (566x345 + 567) / (567x345 + 222)

(566x345+567)/(567x345+222)
=(566x345+345+222)/(567x345+222)
=[345x(566+1)+222]/(567x345+222)
=(567x345+222)/(567x345+222)
=1

How to calculate 567 * 345 + (567-222)

567*(345+1)-222