решите уравнения: а) 64/112 = 2,8/4x-3,1
б) (3/8х) : 14 = 3 : 4 2/3

a) 64 (4x-3,1)=112×2,8256x-198,4=313,6256x=313,6+198,4256x=512x=512÷256x=2b) (3/8x)÷14=3÷14/3(3/8x)÷14=3×3/14(3/8x)÷14=9/143/8x=9/14×143/8x=972x=3x=1/24