1.
5 + 2y + 6 + y + 5 + 4 + x + 7 + x + 3 = 2x + 3y + 30
Odp. C.
2.
4k + 1, 4k + 3, 4k + 5, 4k + 7
3.
I. 5x - 3y + 4x - 7y = 9x - 10y ≠ 2x + 3y + 30
II. -2(x - y + 3z - 1) = -2x + 2y - 6z +2
III. (2x + 2y) + (x - y) - (x - 2y) = 2x + 2y + x - y - x + 2y = 2x + 3y ≠ 2x + y
Odp. Przekształcenie II.
4.
a) a - 7b = 9 - 7·(-2) = 9 + 14 = 23
c) 4x² - y(5x + 4) = 4·(-1)² - 8[5·(-1) + 4] = 4·1 - 8(-5 + 4) = 4 - 8·(-1) = 4 + 8 = 12
5.
I. 4x · 3y = 12xy
II. (4 + x) · 3y = 12y + 3xy = 3xy + 12y
III. 2x · (3 + y) = 6x + 2xy
IV. 6x · 2y = 12xy
Odp. I i IV
