1.zadanie x+15=70 85=2*x x trzecich = 12 x+5=2*(x+1) 2.zadanie 12%x=6 100%a+10%a=143 100%y-14%y=40,42 100%x+110%x=23,1

x+15=70 x=70-15 x=55 85=2*x/:2 x=42 i 1/2 x trzecich = 12 /*3 x=36 x+5=2*(x+1) x+5=2x+2 x-2x=2-5 -x=-3/ * -1 x=3 2.zadanie 12%x=6 100% = x x= 100*6 / 12 x= 600/12 x=50 100%a+10%a=143 110% - 143 100% - a a= 100*143 / 110 a= 14300/110 a=130 100%y-14%y=40,42 86% - 40,42 100% - y y= 100*40,42 / 86 y= 4020/86 y=46,74 100%x+110%x=23,1 210% = 23,1 100%=x x= 100*23,1/210 x=2310/210 x=11 Licza na naj;]