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

Toán Lớp 8: `a)“\frac{14x^4y^3}{7x^3y^4}` `b)\frac{-6x^3y}{12x^2y}` `c)\frac{4x+10}{2x^2+5x}` `d)\frac{x-1}{(1-x)^3` `e)\frac{x^7+x^6+x^5+x^4+x^3+

Toán Lớp 8: a)\frac{14x^4y^3}{7x^3y^4}
b)\frac{-6x^3y}{12x^2y}
c)\frac{4x+10}{2x^2+5x}
d)\frac{x-1}{(1-x)^3
e)\frac{x^7+x^6+x^5+x^4+x^3+x^2+x+1}{x^4-1}

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a) $\frac{14x^{4}y^{3}}{7x^{3}y^{4}}$
    = $\frac{2x}{y}$ 
    b) $\frac{-6x^{3}y}{12x^{2}y}$
    = $\frac{-x}{2}$
    c) $\frac{4x+10}{2x^{2}+5x}$ 
    = $\frac{2(2x+5)}{x(2x+5)}$ 
    = $\frac{2}{x}$ 
    d) $\frac{x-1}{(1-x)^{3}}$
    = $\frac{-(1-x)}{(1-x)^{3}}$
    = $\frac{-1}{(1-x)^{2}}$
    e) $\frac{x^{7}+x^{6}+x^{5}+x^{4}+x^{3}+x^{2}+x+1}{x^{4}-1}$ 
    = $\frac{(x^{7}+x^{5})+(x^{6}+x^{4})+(x^{3}+x)+(x^{2}+1)}{(x^{2}-1)(x^{2}+1)}$ 
    = $\frac{x^{5}(x^{2}+1)+x^{4}(x^{2}+1)+x(x^{2}+1)+(x^{2}+1)}{(x^{2}-1)(x^{2}+1)}$ 
    = $\frac{(x^{2}+1)(x^{5}+x^{4}+x+1)}{(x^{2}-1)(x^{2}+1)}$ 
    = $\frac{x^{5}+x^{4}+x+1}{x^{2}-1}$ 
    = $\frac{(x^{5}+x^{4})+(x+1)}{(x-1)(x+1)}$ 
    = $\frac{x^{4}(x+1)+(x+1)}{(x-1)(x+1)}$ 
    = $\frac{(x+1)(x^{4}+1)}{(x-1)(x+1)}$ 
    = $\frac{x^{4}+1}{x-1}$ 

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

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