問數學題~~~~~~~~~

(x+4)²


=(x+4)(x+4)


=x²+4x+4x+16


=x²+8x+16



3.(3+x)³


=(3+x)(3+x)(3+x)


=(9+3x+3x+x²)(3+x)


=27+18x+3x²+9x+6x²+x³


=x³+9x²+27x+27



5.(2x+1)²


=(2x)²+2x+2x+1


=4x²+4x+1



(2+3x)²


=4+6x+6x+9x²


=9x²+12x+4



9.[3(x-y)]²


=9(x-y)²


=9(x²-xy-xy+y²)


=9x²-18xy+9y²



(x+4y)²


=x²+4xy+4xy+16y²


=x²+8xy+16y²



3(4x+3y)²


=3[(4x)²+12xy+12xy+(9y)²]


=3(16x²+24xy+81y²)


=48x²+72xy+243y²



15.(11x+2t)²


=121x²+44xt+4t²



17.(x²-8)


=[x²-[2(2)^0.5]²]


=[x-2(2)^0.5][x+2(2)^0.5]



19.4(x²+9)²


=4(x^4+18x²+81)


=4x^4+72x²+324//



21.(x²-y²)²


=x^4-2x² y²+y^4



23.(-x-y)²


=[-(x+y)]²


=(x+y)²


=x²+2xy+y²



25.(xy+2)²


=x²y²+4xy+4



27.(ab+3xy)²


=a² b²+6xyab+9x²y²



29.(x³+3)²


=x^6+6x³+9

1.(x+4)^2
=(x+4)(x+4)
=x^2+4x+4x+16
=x^2+8x+16//


3.(3+x)^3
=(3+x)(3+x)(3+x)
=(9+3x+3x+x^2)(3+x)
=27+18x+3x^2+9x+6x^2+x^3
=x^3+9x^2+27x+27//


5.(2x+1)^2
=(2x)^2+2x+2x+1
=4x^2+4x+1//


7.(2+3x)^2
=4+6x+6x+9x^2
=9x^2+12x+4//


9.[3(x-y)]^2
=9(x-y)^2
=9(x^2-xy-xy+y^2)
=9x^2-18xy+9y^2//


11.(x+4y)^2
=x^2+4xy+4xy+16y^2
=x^2+8xy+16y^2//


13.3(4x+3y)^2
=3[(4x)^2+12xy+12xy+(9y)^2]
=3(16x^2+24xy+81y^2)
=48x^2+72xy+243y^2//


15.(11x+2t)^2
=121x^2+44xt+4t^2//


17.(x^2-8)
=[x^2-[2(2)^0.5]^2]
=[x-2(2)^0.5][x+2(2)^0.5]//


19.4(x^2+9)^2
=4(x^4+18x^2+81)
=4x^4+72x^2+324//


21.(x^2-y^2)^2
=x^4-2x^2 y^2+y^4//


23.(-x-y)^2
=[-(x+y)]^2
=(x+y)^2
=x^2+2xy+y^2//


25.(xy+2)^2
=x^2y^2+4xy+4//


27.(ab+3xy)^2
=a^2 b^2+6xyab+9x^2y^2//


29.(x^3+3)^2
=x^6+6x^3+9//