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

Toán Lớp 8: A = 1 /2x – 3 + 4x-7 / 2x-3 B= 5 / x-5 + 1 / x+5 – 2x / x^2 – 25

Tháng Sáu 3, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: A = 1 /2x – 3 + 4x-7 / 2x-3
B= 5 / x-5 + 1 / x+5 – 2x / x^2 – 25

Comments ( 2 )

  1. hoquyly
    hoquyly
    3 Tháng Sáu, 2022 at 7:30 chiều
    Reply
    $A$ $=$ $\frac{1}{2x-3}$ $+$ $\frac{4x-7}{2x-3}$ 
    $A$ $=$ $\frac{1+4x-7}{2x-3}$ 
    $A$ $=$ $\frac{4x-6}{2x-3}$
    $A$ $=$ $\frac{2(2x-3)}{2x-3}$ 
    $A$ $=$ $2$
    ——————————————————-
    $B$ $=$ $\frac{5}{x-5}$ $+$ $\frac{1}{x+5}$ $-$ $\frac{2x}{x^2-25}$ 
    $B$ $=$ $\frac{5}{x-5}$ $+$ $\frac{1}{x+5}$ $-$ $\frac{2x}{(x-5)(x+5)}$ 
    $MTC:$ $(x-5)(x+5)$
    $B$ $=$ $\frac{5(x+5)}{(x-5)(x+5)}$ $+$ $\frac{1(x-5)}{(x-5)(x+5)}$ $-$ $\frac{2x}{(x-5)(x+5)}$  
    $B$ $=$ $\frac{5(x+5)+1(x-5)-2x}{(x-5)(x+5)}$
    $B$ $=$ $\frac{5x+25+x-5-2x}{(x-5)(x+5)}$ 
    $B$ $=$ $\frac{4x+20}{(x-5)(x+5)}$ 
    $B$ $=$ $\frac{4(x+5)}{(x-5)(x+5)}$ 
    $B$ $=$ $\frac{4}{x-5}$
    $Chúc$ $bạn$ $học$ $tốt!$

  2. diepbich93
    diepbich93
    3 Tháng Sáu, 2022 at 7:30 chiều
    Reply
    Lời giải và giải thích chi tiết:
    A=1/(2x-3)+(4x-7)/(2x-3) (x \ne 3/2)
    = (1+4x-7)/(2x-3)
    =(4x-6)/(2x-3)
    =(2(2x-3))/(2x-3)
    =2
    B=5/(x-5)+1/(x+5)-(2x)/(x^2 -25) (x \ne +-5)
    =5/(x-5)+1/(x+5)-(2x)/((x-5)(x+5))
    =(5(x+5))/((x-5)(x+5))+(x-5)/((x-5)(x+5))-(2x)/((x-5)(x+5))
    =(5(x+5)+x-5-2x)/((x-5)(x+5))
    =(5x+25+x-5-2x)/((x-5)(x+5))
    =(4x+20)/((x-5)(x+5))
    =(4(x+5))/((x-5)(x+5))
    =4/(x-5)

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

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