Răspuns:
a) 4.......128 lei
8 .......? lei
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[tex] \frac{4}{8} = \frac{128}{x} \\ 8 \times 128 = 1024 \\ x = 1024 \div 4 \\ x = 256[/tex]
b) 10 ....... ? lei
5 ......... 500 lei
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[tex] \frac{10}{5} = \frac{x}{500} \\ x = \frac{10 \times 500}{5} \\ x = \frac{5000}{5} \\ x = 1000 \: lei \\ [/tex]
10 ...... 1000 lei
x .......... 400 lei
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[tex] \frac{10}{x} = \frac{1000}{400} \\ x = \frac{10 \times 400}{1000} \\ x = \frac{4000}{1000} \\ x = 4[/tex]
