1. x · y = xy
2. a) y - 3 b) r + p c) w/8 d) 2(1 - x) = 2 - 2x
3. a) 6 · 7 + 3 = 42 + 3 = 45 b) 5 · (-4) + 10 = (-20) + 10 = (-10) c) 7 · 9 + 7 · 0 = 63 - 0 = 63 d) 6 - 10 · 1/5 = 6 - 2 = 4
4. 2 · (-1) + 2 = (-2) + 2 = 0 6 · 7 - 6 · 3 = 42 - 18 = 24
5. a) -x + 2x = x b) -4x
6. -2x + x + 5x = (-x) + 5x = 4x
7. a) 7x + 5x - 2x + 3x - 4 + 6 = 13x + 2 b) 7,4a + 0,6 c) 2/3y + 2y + 1/3y + 5 - 4 = 3y + 1
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1. x · y = xy
2. a) y - 3
b) r + p
c) w/8
d) 2(1 - x) = 2 - 2x
3. a) 6 · 7 + 3 = 42 + 3 = 45
b) 5 · (-4) + 10 = (-20) + 10 = (-10)
c) 7 · 9 + 7 · 0 = 63 - 0 = 63
d) 6 - 10 · 1/5 = 6 - 2 = 4
4. 2 · (-1) + 2 = (-2) + 2 = 0
6 · 7 - 6 · 3 = 42 - 18 = 24
5. a) -x + 2x = x
b) -4x
6. -2x + x + 5x = (-x) + 5x = 4x
7. a) 7x + 5x - 2x + 3x - 4 + 6 = 13x + 2
b) 7,4a + 0,6
c) 2/3y + 2y + 1/3y + 5 - 4 = 3y + 1