Решите уравнение. 1) 4/7х + 1 3/7 = 6/7х - 5 5/7; 2) 2(х-3)-4(х+1)=5х-38; 3) 5/9х+ 17/9=2/9+7/9; 4) 2(х+2)-4(х-3)=5х+9.
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Ответы на вопрос:
1) 4/7х + 1 3/7 = 6/7х - 5 5/7; 4/7х - 6/7х = -5 5/7 - 1 3/7; -2/7х = -7 1/7; х = -7 1/7 : (- 2/7); х = - 50/7 : (- 2/7); х = - 50/7 * (- 7/2); х = 25. 2) 2(х-3)-4(х+1)=5х-38; 2х-6-4х-4=5х-38; 2х-4х-5х=-38+6+4; -7х=-28; х=4. 3) 5/9х+ 17/9=2/9+7/9; 5/9х=2/9+7/9-17/9; 5/9х=-8/9; х=-8/9: 5/9; х=-8/5; х=-1,8. 4) 2(х+2)-4(х-3)=5х+9; 2х+4-4х+12=5х+9; 2х-4х-5х=9-4-12; -7х=-7; х=1.
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