次の式を因数分解せよ。 [23~28] 23 (1) 3ay-6xy (4) (7) a(x-y)-x+y (@+6)r+2(a+b) (2) 2ab²-4a²b+ab (5) 5y(y-4)+2(y−4) (8) x-2y+a(4x-8y) (3) x(y+z)+x² (6) m(a−b)ta-b (9) a(x-y)+b(y-x) 8

a (x-4)-1(x-4) • 7/) a(x−y) - x+y = a(x-4) = (X-Y) ⋅ (x-y) (a+l) (x-y) (a−1)