А) 7/5•(-15/7)•1/6•х=9/2•17/18•36/34
-105/210•х=(9•17•36)/(2•18•34)
-1/2•х=9/2
х=-9
б) 25/8•(-8/5)•(-4/15)•(-х)=36/17•34/9•
•(-15/16)
(25•8•4)/(8•5•15)•(-х)=-(36•34•15)/(17•
•9•16)
(•15 /•2
4/3•(-х)=-15/2
х=(15•3)/(2•4)
х=5 5/8
в) -19/8•(-16/57)•6/5•х=71/9•33/71•(-7/5)
(19•16•6)/(8•57•5)•х=(71•33•(-7)/(9•71•5)
228/285•х=(-231/45)
х=(-231•285)/(45•228)
х=(-65835/10260)
х=-6 855/2052
г) -39/16•(-48/13)•(-17/24)•(-х)=
=-17/6•9/2•(-8/5)
(-39•48•17)/(16•13•24)•(-х)=(17•9•8)/(6•2•5)
-51/8•(-х)=51/5
х=(51•8)/(51•5)
х=8/5
х= 1 3/5