Question

Efectuati:
a)0,05+1/3=
b)4,4-1 intrat 5/6=
c)7/12•0,8
d)7/15:0,7
e)0,25+1/5-0,2=

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Va roggg

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Answer 1

Răspuns:

Salut

a)0,05+1/3=1/20+1/3=23/60;

b)4,4-1 5/6=22/5-5/6= 107/30;

c)7/12•0,8=7/12•4/5= 7/3•1/5= 7/15;

d)7/15:0,7= 7/15:7/10= 7/15•10/7= 1/3•2= 2/3;

e)0,25+1/5-0,2= 0,25+0,2-0,2= 0,25.

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Answer 2

a)

$0.05 + \frac{1}{3} = \frac{5}{100} + \frac{1}{3} = \frac{1}{20} + \frac{1}{3} = \frac{3}{60} + \frac{20}{60} = \frac{3 + 20}{60} = \frac{23}{60}$

b)

$4.4 - 1 \frac{5}{6} = \frac{44}{10} - \frac{6 + 5}{6} = \frac{22}{5} - \frac{11}{6} = \frac{6\times \: 22 }{30} - \frac{11 \times 5}{30} = \frac{132 - 55}{30} = \frac{77}{30}$

c)

$\frac{7}{12} \times 0.8 = \frac{7}{12} \times \frac{8}{10} = \frac{7}{3} \times \frac{1}{5} = \frac{7}{15}$

d)

$\frac{7}{15} \div 0.7 = \frac{7}{15} \div \frac{7}{10} = \frac{7}{15} \times \frac{10}{7} = \frac{1}{3} \times \frac{2}{1} = \frac{2}{3}$

e)

$0.25 + \frac{1}{5} - 0.2 = \frac{25}{100} + \frac{1}{5} - \frac{2}{10} = \frac{1}{4} + \frac{1}{5} - \frac{1}{5} = \frac{1}{4}$