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(12,75-3×¼):(2,2+7,8+1⅘)=
= (12,75 - ¾ ): (2,2 + 7,8 + 1,8) =
= (12,75 - 0,75) : (2,2 + 7,8 + 1,8) =
= (12):(11,8)=120: 118= 1 i 2/118 = 1 i1/59
20%x = 120/118
0,2x = 120/118
x = 120/118 × 10/2
x = 120/118 × 5
x = 600/118
x= 300/59
x = 5 i 5/59