2)1/4*1/(3/4х-1/2)+2/5=1/21/4*1/(3/4х-1/2)=1/2-2/51/4*1/(3/4х-1/2)=5/10-4/101/4=1/10*(3/4х-1/2)1/4=1*3*х/10*4 - 1/2*101/4=3х/40-1/201/4+1/20=3х/403х/40=1*5/4*5+1/203х/40=5/20+1/203х/40=6/20х=6/20:3/40х=6/20*40/3х=2*2 (6:3; 40:20)х=4примера 1) на фото нет