Tolong yang no 9 dengan cara ya.... Itu nomornya sama guruku divanti

a.6/18 = 7/21= 9/27 ( dikalikan silang dengan yg sdh diketahui)
b. 4/20= 5/25= 6/30
c. 6/27=8/36= 14/63
d.6/8 =15/20 =24/32

a) 
[tex] \frac{6}{18}= \frac{x}{21} \\ \\ 18x=(21).(6) ...........kedua\ ruas\ dibagi\ dengan\ 6 \\ \\ 3x =21 \\ \\ x = \frac{21}{3}= 7 \\ \\ Jadi\ \frac{6}{18}= \frac{7}{21} \\ \\ \\ \frac{6}{18}= \frac{x}{27} \\ \\ 18x=(27).(6) ...........kedua\ ruas\ dibagi\ dengan\ 6 \\ \\ 3x =27 \\ \\ x = \frac{27}{3}= 9 \\ \\ Jadi\ \frac{6}{18}= \frac{9}{27} [/tex]

b)
[tex]\frac{6}{30}= \frac{x}{20} \\ \\ 30x=(20).(6) ...........kedua\ ruas\ dibagi\ dengan\ 6 \\ \\ 5x =20 \\ \\ x = \frac{20}{5}= 4 \\ \\ Jadi\ \frac{6}{30}= \frac{4}{20} \\ \\ \\ \frac{6}{30}= \frac{x}{25} \\ \\ 30x=(25).(6) ...........kedua\ ruas\ dibagi\ dengan\ 6 \\ \\ 5x =25 \\ \\ x = \frac{25}{5}= 5 \\ \\ Jadi\ \frac{6}{30}= \frac{5}{25} [/tex]

c)
[tex]\frac{8}{36}= \frac{x}{27} \\ \\ 36x=(27).(8) ...........kedua\ ruas\ dibagi\ dengan\ 9 \\ \\ 4x =(3).(8) \\ \\ x = \frac{24}{4}= 6 \\ \\ Jadi\ \frac{8}{36}= \frac{6}{27} \\ \\ \\ \frac{8}{36}= \frac{x}{63} \\ \\ 36x=(63).(8) ...........kedua\ ruas\ dibagi\ dengan\ 9 \\ \\ 4x =(7).(8) \\ \\ x = 7.(\frac{8}{4})= (7).(2)=14 \\ \\ Jadi\ \frac{8}{36}= \frac{14}{63} [/tex]

d)
[tex]\frac{24}{32}= \frac{x}{8} \\ \\ 32x=(24).(8) ...........kedua\ ruas\ dibagi\ dengan\ 8 \\ \\ 4x =24 \\ \\ x = \frac{24}{4}= 6 \\ \\ Jadi\ \frac{24}{32}= \frac{4}{8} \\ \\ \\ \frac{24}{32}= \frac{15}{x} \\ \\ 24x=(32).(15) ...........kedua\ ruas\ dibagi\ dengan\ 8 \\ \\ 3x =(4).(15) \\ \\ x = (4).(\frac{15}{3}= (4).(5)=20 \\ \\ Jadi\ \frac{24}{32}= \frac{15}{20}[/tex]

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