Toán Lớp 8: a) 2×2 + 4x + xy +2y . * a(x – y ) + bx – by . b) x2 +xy – 7x – 7y . * ac + bc + a + b . c) x2 + 2xy + y2 – 4 . * 5a2 – 5ax – 7a + 7x .

Toán Lớp 8: a) 2×2 + 4x + xy +2y . * a(x – y ) + bx – by .
b) x2 +xy – 7x – 7y . * ac + bc + a + b .
c) x2 + 2xy + y2 – 4 . * 5a2 – 5ax – 7a + 7x .
d) 1 – y3 + 6xy2 – 12x2y + 8×3 . * 7z2 – 7yz – 4z + 4y.
e) b2c + bc2 + ac2 – a2 c – ab (a + b ). * x3 + 3×2 + 3x + 9.
f) 2a2b + 4ab2 – a2c – 2abc + ac2 + 2bc2 – 4b2c – 2abc . * 30ax – 34bx – 15a + 17b .
g) x3 – x2 – 5x + 125 . * x3 – x2y – x2z – xyz .
h) x3 + 2×2 – 6x – 27 . * pq – p2 – 5(p – q ).
i) 12×3 + 4×2 – 27x – 9 . + y(a – b) – 2a + 2b .
j) x4 – 25×2 + 20x – 4 . * y2 + 1+ 2y – 49.
k) x2(x2 – 6 ) – x2 + 9. * 36 a2 – c2 – 9b2 – 6bc .
l) x6 – x4 + 2×3 + 2×2 . * ab(a –b )+ b2c – bc2 + c2a – ca2.
nhanhhh nhaaa