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

Toán Lớp 8: 1,Tính a,(4x-3y)×2x^2 b,(3x-2y)×(3x+2) c,(6x^2y-5xy^3+2xy^2)÷2xy

Toán Lớp 8: 1,Tính
a,(4x-3y)×2x^2
b,(3x-2y)×(3x+2)
c,(6x^2y-5xy^3+2xy^2)÷2xy

Comments ( 2 )

  1. (4x – 3y)2x^2
    = 8x^3 – 6x^2y 
    $\\$
    (3x-2y)(3x+2)
    = 9x^2 + 6x – 6xy – 4y
    $\\$
    (6x^2y -5xy^3 + (2xy^2) : 2xy
    = {6x^2y}/{2xy} – {5xy^3}/{2xy} + {2xy^2}/{2xy}
    = 3x – 5/2y^2 + y 

  2. a) $(4x-3y).2x^{2}$ $=8x^{3}-6x^{2}y$
    b) $(3x-2y).(3x+2)$ $=$  $9x^{2}+6x-6xy-4y$
    c) $(6x^{2}y-5xy^{3}+2xy^{2}):2xy$ $=$ $3x-\frac{5}{2}y^{2}+y$,

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