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

Toán Lớp 7: a)(- 2/5 – 3/7 ): 4/5 +(- 1/5 + 3/7 ): 4/5 b) -2/7 * 5/3 + -2/7 . 1/3

Home/ Toán Lớp 7: a)(- 2/5 – 3/7 ): 4/5 +(- 1/5 + 3/7 ): 4/5 b) -2/7 * 5/3 + -2/7 . 1/3

Toán Lớp 7: a)(- 2/5 – 3/7 ): 4/5 +(- 1/5 + 3/7 ): 4/5 b) -2/7 * 5/3 + -2/7 . 1/3

Tháng Mười Hai 31, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a)(- 2/5 – 3/7 ): 4/5 +(- 1/5 + 3/7 ): 4/5
b) -2/7 * 5/3 + -2/7 . 1/3

Comments ( 2 )

  1. giangnguyen33
    giangnguyen33
    31 Tháng Mười Hai, 2022 at 8:45 sáng
    Reply
    $\text{a) ( $\dfrac{-2}{5}$ – $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$  + ( $\dfrac{-1}{5}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ }$
    $\text{= ( $\dfrac{-2}{5}$ – $\dfrac{3}{7}$ ) . $\dfrac{5}{4}$ + ( $\dfrac{-1}{5}$ + $\dfrac{3}{7}$ ) . $\dfrac{5}{4}$ }$
    $\text{= ( $\dfrac{-2}{5}$ – $\dfrac{3}{7}$ + $\dfrac{-1}{5}$ + $\dfrac{3}{7}$ ) . $\dfrac{5}{4}$ }$
    $\text{= [( $\dfrac{-2}{5}$ + $\dfrac{-1}{5}$ ) + ( $\dfrac{-3}{7}$ + $\dfrac{3}{7}$ )] . $\dfrac{5}{4}$}$
    $\text{= [$\dfrac{-3}{5}$ + 0 ] . $\dfrac{5}{4}$}$
    $\text{= $\dfrac{-3}{5}$ . $\dfrac{5}{4}$}$
    $\text{= $\dfrac{-3}{4}$}$
    $\text{b) $\dfrac{-2}{7}$ . $\dfrac{5}{3}$ + $\dfrac{-2}{7}$ . $\dfrac{1}{3}$}$
    $\text{= $\dfrac{-2}{7}$ . ( $\dfrac{5}{3}$ + $\dfrac{1}{3 )}$}$
    $\text{= $\dfrac{-2}{7}$ . 2}$
    $\text{= $\dfrac{-4}{7}$}$
    $\text{________________________________________________________}$
    $\text{Áp dụng:}$
    $\text{b) a . b + a . c}$
    $\text{= a . ( b + c )}$
    $\text{_______________________________________________________}$
    $\text{Áp dụng:}$
    $\text{a) a . b + c . b}$
    $\text{= ( a + c ) . b}$

  2. diemchau
    diemchau
    31 Tháng Mười Hai, 2022 at 8:45 sáng
    Reply
    $ a) ( -2/5 – 3/7 ) : 4/5 + ( -1/5 + 3/7 ) : 4/5 $ 
    $ = ( -2/5 – 3/7 ) . 5/4 + ( -1/5 + 3/7 ) . 5/4 $ 
    $ = [ ( -2/5 – 3/7 ) + ( -1/5 + 3/7 ) ] . 5/4 = [ ( -2/5 -1/5 ) + ( -3/7 + 3/7 ) . 5/4 $ 
    $ = -3/5 . 5/4 = -3/4 $ 
    $ b) -2/7 . 5/3 + -2/7 . 1/3 = -2/7 . ( 5/3 + 1/3 ) = -2/7 . 6/3 = -2/7 . 2 = -4/7 $ 

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

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