Решите пропорции, пожалуйста.
1) 3*1/3х*3/14=4*2/7*1,5; х*3/14=4*2/7*3/2; 3/14х=4*1/7*3; 3/14х=12/7; х=8. Ответ:8. 2) 12х=3*1/7*1/8; 12х=3/56; х=1/224; Ответ:1/224. 13.1) 6*1/2:х=6*5/6:4,1; 6*1/2*4,1=6*5/6х; 12,3=5х; х=2,46. Ответ:2,46. 13.2) 21/38=3/4:4/5*х; 21/38=3/4*5/4х; 21/38=15/16х; х=56/95. Ответ:56/95.
13.1 6,5:х=6 5/6:4,1⇒х*6 5/6=6,5*4,1=26,65⇒х=26,65:6 5/6=26,65*6/41=3,9
13.2 3 7/19*0,8*x=1,5*2 3/8=1,5*2,375=3,5625⇒0,8*x=3,5625:3 7/19=3,5625*19/64=67,6875/64⇒x=67,6875/(64*0,8)=67,6875/51,2=676875/512000=5415/4096=1 1319/4096