Uprość wyrażenia :
a) 2a(b-3)-2b(a-3)
b) a(a+b)+a(a-b)+b(b+a)
c) 3(a+2b)-2(a-2c)+5(c-b)
Proszę na dzisiaj :)
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a)
2a(b - 3) - 2b(a - 3) = 2ab - 6a - 2ab + 6b = - 6a + 6b = - 6 · (a - b)
b)
a(a + b) + a(a - b) + b(b + a) = a² + ab + a² - ab + b² + ab = 2a² + ab + b²
c)
3(a + 2b) - 2(a - 2c) + 5(c - b) = 3a + 6b - 2a + 4c + 5c - 5b = a + b + 9c