Question

a) 3 (x+y)
b)2(a-b)
c)7(x.2y)
d)2.(3a+4b)
e)x.(y-2)
f)a-(a-1)
g) a-(a+b)
h)x2.(x-1)
Calcule !

Answer 1

3(x + y) = 3x + 3y
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2(a - b) = 2a - 2 b
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7(x.2y) = 14xy       ou    7( x - 2y) = 7x - 14y    não entendi bem
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2(3a + 4b) = 6a + 8b 
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x.(y - 2 ) = xy - 2x 
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a - (a - 1) = a - a + 1 = 1          ou a(a - 1) = a² - a     não entendi bem
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a - ( a + b) = a - a + b = b        ou a .(a + b) = a² + ab
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x²(x - 1) = x³ - x²
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