數學
高中

1)
(x+1)(x+2)(x+3)(x+6)-15x²
2)
(xy+1)(x+1)(y+1)+xy
3)
x²+xy-2y²-2x+5y-3
*因式分解

解答

For your reference

凱蒂

can't understand

Call me Bravo

Which one? Which steps?

凱蒂

all three,
I can't understand how do you get the answers

凱蒂

also the first steps you wrote

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