a, (x-3) .(2x+5)
b, (x-1)∧2+x.(2-x)
c, (x+1)∧3-(x-1) (x∧2+x+1)
d, (x+3)∧2+2.(x+3).(x-3)+(x-3)∧2
e, (x+1)∧3+(x-1) (x∧2+x+1)
f, (x-2).( x∧2+2x+4)-x(x∧2-1)
Gíup mk nhanh vs ạ
a, (x-3) .(2x+5)
b, (x-1)∧2+x.(2-x)
c, (x+1)∧3-(x-1) (x∧2+x+1)
d, (x+3)∧2+2.(x+3).(x-3)+(x-3)∧2
e, (x+1)∧3+(x-1) (x∧2+x+1)
f, (x-2).( x∧2+2x+4)-x(x∧2-1)
Gíup mk nhanh vs ạ
a, (x-3) .(2x+5)
=2x²+5x-6x-15
=2x²-x-15
b, (x-1)∧2+x.(2-x)
=x²-2x+1+2x-x²
=1
c, (x+1)∧3-(x-1) (x∧2+x+1)
=x³+3x²+3x+1-(x³+x²+x-x²-x-1)
=x³+3x²+3x+1-x³+1
=3x²+3x+2
d, (x+3)∧2+2.(x+3).(x-3)+(x-3)∧2
=x²+6x+9+2×(x²-9)+x²-6x+9
=2x²+18+2x²-18
=4x²
e, (x+1)∧3+(x-1) (x∧2+x+1)
=x³+3x²+3x+1 +x³+x²+x-x²-x-1
=2x³+3x²+3x
f, (x-2).( x∧2+2x+4)-x(x∧2-1)
=x³+2x²+4x-2x²-4x-8-(x³-x)
=x³-8-x³+x
=x-8
xin ctlhn