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

Toán Lớp 8: 1. 5????^2 − ( 2???? + 1 )( ???? − 2 ) − ???? ( 3???? + 3 ) + 7 2) ( 3???? − 1)(2???? + 3 ) −( ????-5)( 6????−1) − 38x 3. ( 5???? − 2)(???? + 1) −( ????- 3)

Tháng Mười Hai 30, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1. 5????^2 − ( 2???? + 1 )( ???? − 2 ) − ???? ( 3???? + 3 ) + 7
2) ( 3???? − 1)(2???? + 3 ) −( ????-5)( 6????−1) − 38x
3. ( 5???? − 2)(???? + 1) −( ????- 3)( 5???? + 1 ) − 17(x−2)

Comments ( 1 )

  1. truongthanhhung
    truongthanhhung
    30 Tháng Mười Hai, 2022 at 1:47 sáng
    Reply
    (1)5x^2-(2x+1)(x-2)-x(3x+3)+7
    =5x^2-2x^2+4x-x+2-3x^2-3x+7
    =(5x^2-2x^2-3x^2)+(4x-x-3x)+2+7
    =9
    (2)(3x-1)(2x+3)-(x-5)(6x-1)-38x
    =6x^2+9x-2x-3-6x^2+x+30x-5-38x
    =(6x^2-6x^2)+(9x-2x+x+30x-38)-3-5
    =-8
    (3)(5x-2)(x+1)-(x-3)(5x+1)-17(x-2)
    =5x^2+5x-2x-2-5x^2-x+15x+3-17x+34
    =(5x^2-5x^2)+(5x-2x-x+15x-17x)-2+3+34
    =35

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

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