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

Toán Lớp 8: thực hiện phép chia a,[15.(x-y)^3+12.(y-x)^2-x+y]:(3y-3x) b,[5.(x-2y)^4+(x-2y)^2+2y-x]:(x-2y) c,[6.(x+y)^3-5.(x+y)^2+3.(x+y)]:(x+y)

Toán Lớp 8: thực hiện phép chia
a,[15.(x-y)^3+12.(y-x)^2-x+y]:(3y-3x)
b,[5.(x-2y)^4+(x-2y)^2+2y-x]:(x-2y)
c,[6.(x+y)^3-5.(x+y)^2+3.(x+y)]:(x+y)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a,[15.(x-y)^3+12.(y-x)^2-x+y]:(3y-3x)
    =[15(x-y)^3+12(x-y)^2-(x-y)]:[-3(x-y)]
    =[(x-y)[15(x-y)^2+12(x-y)-1]:(-3(x-y))
    =-(15(x-y)^2+12(x-y)-1)/3
    =-(15x^2-30x+15y^2+12x-12y-1)/3
    b,[5.(x-2y)^4+(x-2y)^2+2y-x]:(x-2y)
    =[5(x-2y)^4+(x-2y)^2-(x-2y)]:(x-2y)
    =(x-2y)[5(x-2y)^3+(x-2y)-1)]:(x-2y)
    =5(x-2y)^3+(x-2y)-1
    =5x^3-30x^2y+60xy^2-40y^3+x-2y-1
    c,[6.(x+y)^3-5.(x+y)^2+3.(x+y)]:(x+y)
    =(x+y)[6(x+y)^2-5(x+y)+3)]:(x+y)
    =6(x+y)^2-5(x+y)+3
    =6x^2+12xy+6y^2-5x-5y+3

  2. Giải đáp + Lời giải và giải thích chi tiết:
    a,[15.(x-y)^3+12.(y-x)^2-x+y]:(3y-3x)
    =[15.(x-y)^3 + 12.(x – y)^2-(x- y)]: [-3(x – y)]
    =15.(x-y)^3 : [-3(x – y)] + 12.(x – y)^2 : [-3(x – y)] – (x- y) : [-3(x – y)]
    =-5(x – y)^2 – 4(x – y) + 1/3
    b),[5.(x-2y)^4+(x-2y)^2+2y-x]:(x-2y)
    =,[5.(x-2y)^4+(x-2y)^2- (x – 2y)]:(x-2y)
    =5.(x-2y)^4 :(x-2y) + (x-2y)^2 :(x-2y) – (x – 2y) : (x-2y)
    =5(x – 2y)^3 + (x – 2y) – 1
    c,[6.(x+y)^3-5.(x+y)^2+3.(x+y)]:(x+y)
    =6.(x+y)^3 :(x+y) -5.(x+y)^2 :(x+y) +3.(x+y ): (x+y)
    =6(x + y)^2 – 5(x  y) + 3
     

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