Question

1) Efetue, simplificando quando possível. (Quando o numero estiver solitário é algarismo inteiro.)

a) 1/2 + 1/3 + 1/4 =

b) 2 1/2+ 3 1/4=

c) 3/2+ 1/6 + 2/3 =

d) 1 - 5/6+ 7/8

e) 2 - 5/6 + 3/4=

f) 1/4 + 2/5 + 3/2 =

g)7/8 + 1 1/4 + 2/3 =

h) 8/16 - 1/4 + 1/2=

i) 1 + 2 1/4 + 1 1/2=

j) 1 1/3 + 2 1/6 +4 =

k)1/2 + 1/4 + 1/8 + 1/6 =

L) 2/15 + 5/6 + 1/2 - 5/10 =




30 Pontos oferecidos para quem fazer tudo!!! =]

Answer 1

a) 1/2 + 1/3 + 1/4 =

mmc = 12

$\frac{6+4+3}{12} =\frac{13}{12} ~ou~1\frac{~1}{12}~(um~inteiro~e~doze~avos)$

b) 2 1/2+ 3 1/4= (é o mesmo que 2 + 1/2 + 3 + 1/4)

$\frac{2}{1}+\frac{1}{2} +\frac{3}{1} +\frac{1}{4} \\ \\ mmc=4\\ \\ \frac{8+2+12+1}{4} \\ \\ \frac{23}{4} ~ou~5~\frac{3}{4} ~(cinco~inteiros~e~tres~quartos)$

c) 3/2+ 1/6 + 2/3 =

$mmc=6\\\\\frac{9+1+4}{6}= \\ \\ \frac{14}{6} =\\ \\ \frac{7}{3} ~ou~2\frac{1}{3} ~(dois~inteiros~e~um~terco)$

d) 1 - 5/6+ 7/8

$mmc=24\\\\\frac{24-20+21}{24} =\frac{25}{24} ~ou~1\frac{1}{24}~(um~inteiro~e~um~vinte~e~quatro~ avos)$

e) 2 - 5/6 + 3/4=

$mmc=12\\\\\frac{24-10+9}{12} =\frac{23}{12} ~ou~1\frac{9}{12} ~(um~inteiro~e~nove~doze~avos)$

f) 1/4 + 2/5 + 3/2 =

$mmc=20\\\\\frac{5+8+30}{20} =\frac{43}{20} ~ou~2\frac{2}{20} ~(dois~inteiros~e~dois~vinte~avos)$

g)7/8 + 1 1/4 + 2/3 =

$\frac{7}{8}+\frac{1}{1}+\frac{1}{4} +\frac{2}{3} \\ \\ mmc=24\\ \\ \frac{21+24+6+16}{24} =\frac{67}{24} ~ou~2\frac{19}{24} ~(dois~inteiros~e~dezenove~vinte~e~quatro~avos)$

h) 8/16 - 1/4 + 1/2=

$\frac{8}{16} =\frac{1}{2} \\ \\ \frac{1}{2} -\frac{1}{4} +\frac{1}{2} =\\ \\ mmc=4\\ \\ \frac{2-1+2}{4} =\frac{3}{4}$

i) 1 + 2 1/4 + 1 1/2=

$\frac{1}{1} +\frac{2}{1} +\frac{1}{4} +\frac{1}{1} +\frac{1}{2} \\ \\ mmc=4\\ \\ \frac{4+8+1+4+2}{4} =\frac{19}{4} ~ou~4\frac{3}{4} ~(quatro~inteiros~e~tres~quartos)$

j) 1 1/3 + 2 1/6 +4 =

$\frac{1}{1} +\frac{1}{3} +\frac{2}{1} +\frac{1}{6} +\frac{4}{1} =\\ \\ mmc=6\\ \\ \frac{6+2+12+1+24}{6} =$$\frac{45}{6} = \frac{15}{2} ~ou ~7 \frac{1}{2} ~(sete~inteiros~e ~um~meio)$

k)1/2 + 1/4 + 1/8 + 1/6 =

$mmc=24 \\ \\ \frac{12+6+3+4}{24} = \frac{25}{24} ~ou~ 1\frac{1}{24} ~(um~inteiro~e~um~vinte~e~quatro~avos)$

L) 2/15 + 5/6 + 1/2 - 5/10 =

$mmc=30 \\ \frac{4+25+15-15}{30} = \frac{29}{30} ~(vinte~e~nove~trinta~avos)$