Question

pas cu pas va roooooog​

Answer 1

70)

$(x + 6) \times (y - 10) = 1 = >$

Explicație :Pasul 1 :Egalez fiecare termen din paranteza cu 1.

$x + 6 = 1 = > x = 1 - 6 = > x = - 5$

$y - 10 = 1 = > y = 1 + 10 = 11.$

VERIFICARE :

$( - 5 + 6) \times (11 - 10) = 1 = > 1(11 - 10) = 1 = > 1 = 1. \: adevarat \: deci \: x = - 5 \: si \: y = 11$

71)

$(x - 9) \times (y + 10) = 1 = >$

Explicație :Pasul 1 :Egalez fiecare termen din paranteza cu 1.

$x - 9 = 1 = > x = 1 + 9 = > x = 10.$

$y + 10 = 1 = > y = 1 - 10 = > y = - 9.$

VERIFICARE :

$(10 - 9) \times ( - 9 + 10) = 1 = > 1( - 9 + 10) = 1 = > 1 = 1.adevarat \: x = 10 \: si \: y = - 9.$

73)

$(x - 12) \times (7x + y + 8) = 1 = >$

$x - 12 = 1 = > x = 1 + 12 = > x = 13$

$7x + y + 8 = 1 = > 7 \times 13 + y + 8 = 1 = > 91 + y + 8 = 1 = > 99 + y = 1 = > y = 1 - 99 = > y = - 98.$

VERIFICARE :

$(13 - 12) \times (7 \times 13 + ( - 98) + 8) = 1 = > 1(91 - 98 + 8) = 1 = > 1 = 1. \: adevarat \: x = 13 \: si \: y = - 98.$

$74)(x + 5) \times (8x + y + 11) = 1 = >$

$x + 5 = 1 = > x = 1 - 5 = > x = - 4.$

$8x + y + 11 =8 \times ( - 4) + y + 11 = - 32 + y + 11 = 1 = > - 21 + y = 1 = > y = 1 + 21 = > y = 22.$

VERIFICARE :

$( - 4 + 5) \times (8 \times ( - 4) + 22 + 11) = 1 = > 1( - 32 + 22 + 11) = 1 = > 1 = 1 \: adevarat \: x = - 4 \: si \: y = 22.$

$75)(x - 12) \times (11x - y + 8) = 1 = >$

$x - 12 = 1 = > x = 1 + 12 = > x = 13$

$11x - y + 8 = > 11 \times 13 - y + 8 = 1 = > 143 - y + 8 = 1 = > 151 - y = 1 = > - y = 1 - 151 = > - y = - 150 = > y = 150.$

VERIFICARE :

$(13 - 12) \times (11 \times 13 - 150 + 8) = 1 = > 1(143 - 150 + 8) = 1 = > 1 = 1. \: adevarat \: x = 13 \: si \: y = 150.$