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

Toán Lớp 8: dùng định nghĩa hai phân thức bằng nhau chứng tỏ rằng 100 20xy =– = == 15x 3x ²y 3x(x+5) 3x ==== = ==- 2(

Toán Lớp 8: dùng định nghĩa hai phân thức bằng nhau chứng tỏ rằng
100 20xy
—– = ——
15x 3x ²y
3x(x+5) 3x
———— = ——-
2(x+5) 2

x + 8 ( x + 8 ) ( x – 5 )
——- = ———————
x – 7 ( x -7 ) ( x – 5 )

Comments ( 1 )

  1. Giải đáp:
     $\text{a) *Ta cs:}$
    $\text{100.3x²y= 300x²y}$
    $\text{15x.20xy= 300x²y}$
    $⇔ \dfrac{100}{15x}=\dfrac{20x}{3x²y}$
    $Vậy$ $\dfrac{100}{15x}=\dfrac{20x}{3x²y}$
    $b) \dfrac{3x.(x+5)}{2.(x+5)}=\dfrac{3x}{2}$
    $⇔ \dfrac{3x}{2}=\dfrac{3x}{2}$
    $Vậy$ $\dfrac{3x.(x+5)}{2.(x+5)}=\dfrac{3x}{2}$
    $c) \dfrac{x+8}{x-7}=\dfrac{(x+8).(x-5)}{(x-7).(x-5)}$
    $⇔ \dfrac{x+8}{x-7}=\dfrac{x+8}{x-7}$
    $Vậy$ $ \dfrac{x+8}{x-7}=\dfrac{(x+8).(x-5)}{(x-7).(x-5)}$
     

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

About Thúy Mai