Question

Tìm a,b,c\(\in\)N* biết \(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{3}\)

Answer 1

a) 3x - 6y = 3 . x - 3 . 2y = 3(x - 2y)

b) 2525x² + 5x³ + x²y = x² (2525 + 5x + y)

c) 14x²y – 21xy² + 28x²y² = 7xy . 2x - 7xy . 3y + 7xy . 4xy = 7xy(2x - 3y + 4xy)

d) 2525x(y - 1) - 2525y(y - 1) = 2525(y - 1)(x - y)

e) 10x(x - y) - 8y(y - x) =10x(x - y) - 8y[-(x - y)]

                                    = 10x(x - y) + 8y(x - y)

                                    = 2(x - y)(5x + 4y)

Answer 2

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