Ответы на вопрос:
1) 1/3(х+1) - 2/3(х-1)=2/3(х-3); 1/3х+1/3-2/3х+2/3=2/3х-2; 1/3х-2/3х-2/3х=-2-2/3-1/3; -3/3х=-2цел3/3; -х=-3; х=3. 2) 1/2(3х+7)-3/4(2х-2)=3/4(х+1); 3/2х+7/2-3/2х+3/2=3/4х+3/4; -3/4х=3/4-3/2-7/2; -3/4х=3/4-6/4-14/4; -3/4х=-17/4; х=-17/4÷(-3/4); х=17/4×4/3; х=17/3=5цел2/3. 3) х(х-3)+х(2х-1)=3х(х-2)-3; х^2-3х+2х^2-х=3х^2-6х-3; х^2+2х^2-3х^2-3х-х+6х=-3; 2х=-3; х=1цел1/2.
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