PROSZĘ O POMOCY DAJE NAJJ.... Question from @Krbxijdbdj

Odpowiedź:

$a)\ \ -8\frac{3}{7}+(-\frac{2}{3})=-8\frac{3}{7}-\frac{2}{3}=-8\frac{9}{21}-\frac{14}{21}=-8\frac{23}{21}=-9\frac{2}{21}\\\\b)\ \ -8\frac{3}{7}-(-\frac{2}{3})=-8\frac{3}{7}+\frac{2}{3}=-\frac{59}{7}+\frac{2}{3}=-\frac{177}{21}+\frac{14}{21}=-\frac{163}{21}=-7\frac{16}{21}\\\\c)\ \ |-8\frac{3}{7}|+|-\frac{2}{3}|=8\frac{3}{7}+\frac{2}{3}=8\frac{9}{21}+\frac{14}{21}=8\frac{23}{21}=9\frac{2}{21}$

$d)\ \ |-8\frac{3}{7}|-|-\frac{2}{3}|=8\frac{3}{7}-\frac{2}{3}=8\frac{9}{21}-\frac{14}{21}=7\frac{30}{21}-\frac{14}{21}=7\frac{16}{21}\\\\e)\ \ |-8\frac{3}{7}+(-\frac{2}{3})|=|-8\frac{3}{7}-\frac{2}{3}|=|-8\frac{9}{21}-\frac{14}{21}|=|-8\frac{23}{21}|=|-9\frac{2}{21}|=9\frac{2}{21}\\\\f)\ \ |-8\frac{3}{7}-(-\frac{2}{3})|=|-8\frac{3}{7}+\frac{2}{3}|=|-\frac{59}{7}+\frac{2}{3}|=|-\frac{177}{21}+\frac{14}{21}|=|-\frac{163}{21}|=|-7\frac{16}{21}|=7\frac{16}{21}$

2 votes Thanks 1

alicjasupcio

Odpowiedź:

Najpierw sprowadzamy do wspólnego mianownika

- 8 3/7 + - 2/3 = - 59/7 - 2/3 = - 177/21 - 14/21 = -191/21 = -9 2/21

najmniejszy wspólny mianownik liczby 7 i 3 jest 21

- i + daje nam minus, więc odejmujemy

- 8 3/7 - (- 2/3) = - 59/7 + 2/3 = -177/22 + 14/21 = - 163/21 = - 7 16/21

- i - daje nam +

|- 8 3/7| + |-2/3| = 8 3/7 + 2/3 = 177/21 + 14/21 = 191/21 = 9 2/21

|-a| = |a| => a

|-8 3/7| - | -2/3| = 8 3/7 - 2/3 = 177/21 - 14/21 = 163/21 = 7 16/21

| - 8 3/7 + -2/3 | = | - 8 3/7 - 2/3 | = | - 177/21 - 14/21| = | - 191/21| = 191/21 = 9 2/21

| - 8 3/7 - (- 2/3)| = | - 8 3/7 + 2/3 | = |- 177/21 + 14/21 | = | - 163/21 | = 163/21 = 7 16/21

2 votes Thanks 1

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