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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Triển khai a) ( 2 + xy )^2 b) ( 5 – x^2 ) . ( 5 + x^2 ) c ) ( 2x – y ) . ( 4x^2 + 2xy + y^2 ) d) ( 5 – 3x )^2

Toán Lớp 8: Triển khai
a) ( 2 + xy )^2
b) ( 5 – x^2 ) . ( 5 + x^2 )
c ) ( 2x – y ) . ( 4x^2 + 2xy + y^2 )
d) ( 5 – 3x )^2

Comments ( 2 )

  1. a/ (2+xy)^2
    = 4+4xy+x^2y^2
    b/ (5-x^2)(5+x^2)
    = 25-x^4
    c/ (2x-y)(4x^2+2xy+y^2)
    = 8x^3-y^3
    d/ (5-3x)^2
    = 25-30x-9x^2

  2. Giải đáp + Lời giải và giải thích chi tiết:
    $#hyn$
    $a) (2+xy)^2=2^2+4xy+(xy)^2=4+4xy+x^2y^2$
    $b)(5-x^2)(5+x^2)=5^2-x^4=25-x^4$
    $c)(2x-y)(4x^2+2xy+y^2)=8x^3-y^3$
    $d)(5-3x)^2=5^2-2.5.3x+9x^2=25-30x+9x^2$
     

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222-9+11+12:2*14+14 = ? ( )