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

Toán Lớp 8: làm tính chia: `a)(15x^3y^2-6x^2y-3x^2y^2):6x^2y` `b)(4x^2-9y^2):(2x-3y)` ________ không làm tắt hộ

Toán Lớp 8: làm tính chia:
a)(15x^3y^2-6x^2y-3x^2y^2):6x^2y
b)(4x^2-9y^2):(2x-3y)
________
không làm tắt hộ

Comments ( 2 )

  1. a)
    (15x^3y^2-6x^2y-3x^2y^2):6x^2y
    =15x^3y^2 : 6x^2y-6x^2y:6x^2y-3x^2y^2 :6x^2y
    =5/2xy-1-1/2y
    b)
    (4x^2-9y^2):(2x-3y)
    =[(2x)^2-(3y)^2]:(2x-3y)
    =[(2x-3y)(2x+3y)]:(2x-3y)
    =[(2x-3y)(2x+3y)]/(2x-3y)
    =2x+3y
     

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