Question

conpletati caseta cu un numar, astfel incat sa obtinem propozitii adevarate: a) 75% din 200 este____
b) 1/5= _____%......
c) 20% din _____este 20
ca rog mult!!! e urgenttt!!!​

Answer 1

Răspuns:

$a) \: 75\% \times 200 = \frac{75}{100} \times 200 = \frac{75 \times 200}{100} = \\\frac{15.000}{100} = 150$

$b) \: \frac{1}{5} = 20\% \times x = \frac{1}{5} \div 20 = \frac{1}{5} \div \frac{20}{100} = \\ \frac{1}{5} \times \frac{100}{20} = \frac{1 \times 100}{5 \times 20} = \frac{100}{100} = 1$

$c) \: 20\% \times x = 20 = > \frac{20 {}^{(20} }{100} \times x = 20 = > \\ \frac{1}{5} \times x = 20 = >x = 5 \times 20 = > x = 100$

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