a).12% razy x =6 b).y-14%y=40,42 c).10% a+a = 143 d).x+110%x=23,1 Proszę niech ktoś zrobi ;)

a).12% razy x =6 12% = 12/100 [dwanascie setnych] 12/100 x = 6 x = 6*100/12 = 50 b).y-14%y=40,42 y - 14/100 y = 40,42 100/100y - 14/100 y = 40 i 42/100 86/100 y = 4042/100 y = 4042/100 * 100/86 = 47 c).10% a+a = 143 10/100a + a = 143 110/100 a = 143 a = 143 * 100/110 = 130 d).x+110%x=23,1 x + 110/100x = 231/10 210/100 x = 231/10 x = 231/100 * 100/210 = 1,1

PROCENTY TO CZĘŚCI SETNE 1%=1/100 a).12% razy x =6 12%=12/100 (12/100)*x=6 /*100 12x=600 /:12 x=5 b).y-14%y=40,42 14%=14/100 y-(14/100)y=40,42 /*100 100y-14y=4042 86y=4042 /:86 y=47 c).10% a+a = 143 10%=10/100=1/10 (1/10)a+a=143 /*10 a+10a=1430 11a=1430 /:11 a=130 d).x+110%x=23,1 110%=110/100=11/10=1,1 x+1,1x=23,1 /*10 10x+11x=231 21x=231 /:21 x=11