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

Toán Lớp 7: thu gọn 1) x(x-1/3) -1/2x (2x-3) 2) 6x^2 – (2x+5) (3x-2)

Toán Lớp 7: thu gọn
1) x(x-1/3) -1/2x (2x-3)
2) 6x^2 – (2x+5) (3x-2)

Comments ( 2 )

  1. 1)
    x(x-1/3) -1/2x (2x-3)
    =x^2-1/3x-x^2+3/2
    =x^2-x^2-1/3x+3/2
    =1/3x-3/2 
    2)
    6x^2 – (2x+5) (3x-2)
    =6x^2-[2x(3x-2)+5(3x-2)]
    =6x^2-(6x^2-4x+15x-10)
    =6x^2-6x^2+4x-15x+10
    =11x-10
     

  2. Giải đáp:
     thấy đúng vot anh 5 sao nhé 
    và trả lời hay nhất

    toan-lop-7-thu-gon-1-1-3-1-2-2-3-2-6-2-2-5-3-2

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