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
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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