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-

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)
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  1. 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

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