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

Toán Lớp 6: Rút gọn biểu thức a) A = (x − 5) − (5 − 3x) b) B = 2x − (x + y) − 5y

Toán Lớp 6: Rút gọn biểu thức
a) A = (x − 5) − (5 − 3x) b) B = 2x − (x + y) − 5y

Comments ( 2 )

  1. Lời giải chi tiết:
    a) A=(x-5)-(5-3x)
    A=x-5-5+3x
    A=(x+3x)-(5+5)
    A=4x-10
    b) B=2x-(x+y)-5y
    B=2x-x-y-5y
    B=(2x-x)-(y+5y)
    B=x-6y

  2. $#Star$
    $\text{a) A =( x – 5 ) – ( 5 – 3x )}$
    $\text{= x – 5 – 5 + 3x}$
    $\text{= ( x + 3x ) – ( 5 + 5 )}$
    $\text{= 4x – 10}$
    $\text{b) B = 2x – ( x+ y ) – 5y }$
    $\text{= 2x – x – y – 5y}$
    $\text{= ( 2x – x ) – ( y+ 5y )}$
    $\text{= x – 6y}$
     

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