Odpowiedź :
[tex]a)\\\frac5{100}x=27 /*100\\5x=2700 /:5\\x=540\\\\b) \\\frac{15}{100}x=18 /*100\\15x=1800 /:15\\x=120\\\\c) \\\frac34x=162 /*4\\3x=648 /:3\\x=216\\\\g)\\\frac4{10}x=82 /*10\\4x=820 /:4\\x=205\\\\h) \\\frac6{10}x=78 /*10\\6x=780 /:6\\x=130\\\\i) \\\frac5{100}x=11 /*100\\5x=1100 /:5\\x=2200\\\\d)\\\frac3{10}x=12 /*10\\3x=120 /:3\\x=40\\\\e) \\\frac8{10}x=16 /*10\\8x=160\\x=20\\\\f) \\\\\frac2{100}x=5 /*100\\2x=500 /:2\\x=250[/tex]
POJĘCIE PROCENTU
Procenty to ułamki o mianowniku 100.
1% = 1/100 = 0,01
Aby obliczyć liczbę z danego jej procentu, należy podzielić tę liczbę przez ten procent.
[tex]a) \ 5\% \ wynosi \ 27, \ \ \ to \ \ \ 27:5\% = 27:0,05 = \boxed{540}\\\\b) \ 15\% \ wynosi \ 18, \ \ \ to \ \ \ 18:15\% = 18:0,15 = \boxed{120}\\\\c) \ 75\% \ wynosi \ 162, \ \ \ to \ \ \ 162:75\% = 162:0,75 = \boxed{216}[/tex]
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[tex]g) \ 40\% \ wynosi \ 82, \ \ \ to \ \ \ 82:40\% = 82:0,4 = \boxed{205}\\\\h) \ 60\% \ wynosi \ 78, \ \ \ to \ \ \ 78:60\% = 78:0,6 = \boxed{130}\\\\i) \ 5\% \ wynosi \ 11, \ \ \ to \ \ \ 11:5\% = 11:0,05 = \boxed{220}\\\\d) \ 30\% \ wynosi \ 12, \ \ \ to \ \ \ 12:30\% = 12:0,3 = \boxed{40}\\\\e) \ 80\% \ wynosi \ 16, \ \ \ to \ \ \ 16:80\% = 16:0,8 = \boxed{20}\\\\f) \ 2\% \ wynosi \ 16, \ \ \ to \ \ \ 5:2\% = 5:0,02 = \boxed{250}[/tex]