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5xy * 3xy = 15x²y²
b)
3a/4(-2a/3) = -6a²/12 = -a²/2
c)
-2x * (-3xy) = 6x²y
d)
-4 * (-x/2)(-2x/4) = -4 * 2x²/8 = -x²
e)
(x + 1)/2 + (2x - 1)/4 = [2(x + 1) + (2x - 1)]/4 =
= (2x + 2 + 2x - 1)/4 = (4x + 1)4 = 4x/4 + 1/4 = x + 1/4
f)
-(x + 1) + (2x + 4) = -x - 1 + 2x + 4 = x + 3
g)
3(a² - 4) - (-a² + 2) = 3a² - 12 + a² - 2 = 4a² - 14
5xy * 3xy = 15x²y²
b)
3a/4(-2a/3) = -6a²/12 = -a²/2
c)
-2x * (-3xy) = 6x²y
d)
-4 * (-x/2)(-2x/4) = -4 * 2x²/8 = -x²
e)
(x + 1)/2 + (2x - 1)/4 = [2(x + 1) + (2x - 1)]/4 =
= (2x + 2 + 2x - 1)/4 = (4x + 1)4 = 4x/4 + 1/4 = x + 1/4
f)
-(x + 1) + (2x + 4) = -x - 1 + 2x + 4 = x + 3
g)
3(a² - 4) - (-a² + 2) = 3a² - 12 + a² - 2 = 4a² - 14
5xy * 3xy = 15x²y²
b)
3a/4(-2a/3) = -6a²/12 = -a²/2
c)
-2x * (-3xy) = 6x²y
d)
-4 * (-x/2)(-2x/4) = -4 * 2x²/8 = -x²
e)
(x + 1)/2 + (2x - 1)/4 = [2(x + 1) + (2x - 1)]/4 =
= (2x + 2 + 2x - 1)/4 = (4x + 1)4 = 4x/4 + 1/4 = x + 1/4
f)
-(x + 1) + (2x + 4) = -x - 1 + 2x + 4 = x + 3
g)
3(a² - 4) - (-a² + 2) = 3a² - 12 + a² - 2 = 4a² - 14