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

Toán Lớp 8: a, 5xy-4y/2x^2y^3+3xy+4y/2x^2y^3 b, x+3/x-2+4+x/2-x Tính . Mn giúp mình vs tks

Toán Lớp 8: a, 5xy-4y/2x^2y^3+3xy+4y/2x^2y^3
b, x+3/x-2+4+x/2-x
Tính . Mn giúp mình vs tks

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a)
    {5xy – 4y}/{2x^2 y^3} + {3xy + 4y}/{2x^2 y^3}
    = {5xy – 4y + 3xy + 4y}/{2x^2 y^3}
    = {(5xy + 3xy) + (4y – 4y)}/{2x^2 y^3}
    = {8xy}/{2x^2 y^3}
    = {2xy . 4}/{2xy . xy^2}
    = 4/{xy^2}
    b)
    {x + 3}/{x – 2} + {4 + x}/{2 – x}         
    = {x + 3}/{x – 2} + {4 + x}/{- (x – 2)}
    = {x + 3}/{x – 2} – {4 + x}/{x – 2}
    = {x + 3 – (4 + x)}/{x – 2}
    = {x + 3 – 4 – x}/{x – 2}
    = {- 1}/{x – 2}
    #SunHee

  2. a) {5xy-4y}/{2x^2y^3}+{3xy+4y}/{2x^2y^3}
    ={5xy-4y+3xy+4y}/{2x^2y^3}
    ={8xy}/{2x^2y^3}
    =4/{xy}
    b) {x+3}/{x-2}+{4+x}/{2-x}
    ={x+3}/{x-2}+{-(4+x)}/{x-2}
    ={x+3-4-x}/{x-2}
    ={-1}/{x-2}

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

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