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b)40m²n - 25mn² + 30mn=5mn(8m-5n+6)
c)-4a³y - 15a⁴b ²+ 20a³b⁴=a³(-4y-15ab²+20b⁴)
d)8q(p-a) - 3p(p-a)= (8q-3p)(p-a)
e)2x (a² -b) +3y(b-a²)=2x(a²-b)-3y(a²-b) = (2x-3y)(a²-b)=(2x-3y)(a-√b)(a+√b)
f) (p-q) +2a(q-p) = 1(p-q)-2a(p-q) = (1-2a)(p-q)