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

Toán Lớp 8: a)(2x+1/3)^2 b) (7x-3y)^2 c) (x-5y) (x+5y) d) (x-5)^3 e) (3x+2)^3

Toán Lớp 8: a)(2x+1/3)^2
b) (7x-3y)^2
c) (x-5y) (x+5y)
d) (x-5)^3
e) (3x+2)^3

Comments ( 2 )

  1. #Applesff
    ~ Bạn tham khảo~:
     a) (2x+1/3)²= (2x)²+2.2x.1/3+(1/3)²
                        = 4x²+ 4/3x+1/9
    b) (7x-3y)²=(7x)²-2.7x.3y+(3y)²
                     = 49x²-42xy+9y²
    c) (x-5y).(x+5y)= x²-(5y)²
                           = x²-25y²
    d) (x-5)³ = x³-3.x².5+3.x.5²-5³
                 = x³-15x²+75x-125
    e) (3x+2)³= (3x)³+3.(3x)².2+3.3x.2²+2³
                    = 27x³+54x²+36x+8
    Chúc bạn hc tốt!

  2. Giải đáp+Lời giải và giải thích chi tiết:
     a) (2x+1/3)^2
    =(2x)^2+2.2x.1/3+(1/3)^2
    =4x^2+4/3x+1/9
    b) (7x-3y)^2
    =(7x)^2-2.7x.3y+(3y)^2
    =49x^2-42xy+9y^2
    c) (x-5y)(x+5y)
    =x^2-(5y)^2
    = x^2-25y^2
    d) (x-5)^3
    =x^3-3.x^2.5+3.x.5^2-5^3
    =x^3-15x^2+75x-125
    e) (3x+2)^3
    =(3x)^3+3.(3x)^2.2+3.3x.2^2+2^3
    =27x^3+54x^2+36x+8
    $@Maruko-chan$ 

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

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