2/3 (6,9-1 1/2d)-4,8 (5/8c-2,5d) упростить

Question

2/3 (6,9-1 1/2d)-4,8 (5/8c-2,5d) упростить

Answer 1

2/3*6,9-(2/3*1 1/2d)-(4,8*5/8c)+(4/8*2,5d)=2/3*69/10-(2/3*3/2d)-(48/10*5/8c)+(4/8*25/10d)=23/5-(1d)-(6*2c)+(1/2*5/2d)=23/5-d-12c+(5/4d)=4 3/5-d-12c+5/4d=4 3/5+12c+(-d+5/4d)=4 3/5+12c+(-d+1 1/4d)=4 3/5+12c+1/4d