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

Toán Lớp 8: 1, Tính a, (3x+1/2)^2 b, (5x-y).(5x+y) c, (x-5)^3 d, (2x+3).(2x-3) CTLHN LUÔN @@##

Toán Lớp 8: 1, Tính
a, (3x+1/2)^2
b, (5x-y).(5x+y)
c, (x-5)^3
d, (2x+3).(2x-3)
CTLHN LUÔN @@##

Comments ( 2 )

  1. $a)(3x+\frac{1}{2})^2=9x^2+3x+$ $\frac{1}{4}$
    $b)(5x-y)(5x+y)=25x^2-y^2$
    $c)(x-5)^3=x^3+15x^2+75x+125$
    $d)(2x+3)(2x-3)=4x^2-9$
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    A) (3x+1/2)²= 9x²+2.3x.1/2 + 1/4= 9x²+3x+1/4
    b) (5x-y)(5x+y)= 25x²-y²
    c) (x-5)³= x³- 3.x².5+3.x.5²-5³= x³-15x²+75x-125
    d) (2x+3)(2x-3)= 4x²-9
    Có chỗ nào không hiểu thì hỏi mình nhé!
     

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

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