Odpowiedź:
Zad. 2.9
a) (4x + 3) + (3x + 5) = (2x + 6) + (2x + 7)
4x + 3 + 3x + 5 = 2x + 6 + 2x + 7
7x + 8 = 4x + 13
3x = 5
b) (34x + 29) - (15x + 38) = (39x + 78) - (28x + 15)
34x + 29 - 15x - 38 = 39x + 78 - 28x - 15
19x - 9 = 11x + 63
8x = 72
x = 9
c) (97y + 58) - (73y + 75) = (48y + 83) - (31y + 16)
97y + 58 - 73y - 75 = 48y + 83 - 31y - 16
24y - 17 = 17y + 67
7y = 84
y = 12
d) (39x - 27) - (25x - 48) = (34x - 17) - (23x - 47)
39x - 27 -25x + 48 = 34x - 17 - 23x + 47
14x + 21 = 11x + 30
3x = 9
x = 3
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Odpowiedź:
Zad. 2.9
a) (4x + 3) + (3x + 5) = (2x + 6) + (2x + 7)
4x + 3 + 3x + 5 = 2x + 6 + 2x + 7
7x + 8 = 4x + 13
3x = 5
b) (34x + 29) - (15x + 38) = (39x + 78) - (28x + 15)
34x + 29 - 15x - 38 = 39x + 78 - 28x - 15
19x - 9 = 11x + 63
8x = 72
x = 9
c) (97y + 58) - (73y + 75) = (48y + 83) - (31y + 16)
97y + 58 - 73y - 75 = 48y + 83 - 31y - 16
24y - 17 = 17y + 67
7y = 84
y = 12
d) (39x - 27) - (25x - 48) = (34x - 17) - (23x - 47)
39x - 27 -25x + 48 = 34x - 17 - 23x + 47
14x + 21 = 11x + 30
3x = 9
x = 3