1)(1-7/10)х=2 1/4 2)(1/4+1/5)х=1 4/5

Первый(1-7/10)x=2цел1/4,
(3/10)x=9/4,
x=(9/4)/(3/10),
x=15/2,
x=7,5.
второй (1/4+1/5)x=1цел4/5,
(5/20+4/20)x=9/5,
(9/20)x=9/5,
x=(9/20)/(9/5),
x=1/4,
x=0,25.