obiicz 20 procent wartości niewiadomej x jeżeli :
x:(o,75*4+jedna szósta*1,5)=2
x : ( 0,75 · 4 + ⅙ · 1,5) = 2
x : ( ¾ · 4 + ⅙ · ³/₂ ) = 2
x : ( 3 + ¼ ) = 2
x : 3¼ = 2
x = 2 · 3¼ = 2 · ¹³/₄ = ¹³/₂ = 6½
20% liczby x = 20/100 · 6½ = 2/10 · ¹³/₂ = ¹³/₁₀ = 1,3
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x : ( 0,75 · 4 + ⅙ · 1,5) = 2
x : ( ¾ · 4 + ⅙ · ³/₂ ) = 2
x : ( 3 + ¼ ) = 2
x : 3¼ = 2
x = 2 · 3¼ = 2 · ¹³/₄ = ¹³/₂ = 6½
20% liczby x = 20/100 · 6½ = 2/10 · ¹³/₂ = ¹³/₁₀ = 1,3