8x-4x+5=25 (y-12)*36=1260 851: (13+x)=37 (x-12): 13=82

Question

Математика: 8x-4x+5=25 (y-12)*36=1260 851: (13+x)=37 (x-12): 13=82

КатюшаШамец · Accepted Answer

Системка: (0,4x+0.15y)/(x+y+3)=0.2 ; (0,4x+0.15y+3*0.8)/(x+y+3)=0.5 ; РЕШЕНИЕ: (0.4x+0.15y)=0.2*(x+y+3); 0.4x+0.15y=0.2x+0.2y+0.6; 0.4x-0.2x+0.15y-0.2y=0.6; 0.2x-0.05y=0.6; 0.2x=0.05y+0.6; x=(0.05y+0.6)/0.2; x=0.25y+3; (0.4*(0.25y+3)+0.15y+2.4)/(0.25y+3+y+3)=0.5; (0.1y+1.2+0.15y+2.4)=0.5*(1.25y+6); 0.25y+3.6=0.625y+3; 0.25y-0.625y=3-3.6; -0.375y=-0.6; y=-0.6/(-0.375) ; y=1.6 кг ; x=0.25*1.6+3=3.4 кг ; ответ: 3,4 кг 40% ;
1.6 кг 15%

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