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

Toán Lớp 8: rút gọn : 3x(x-1)+(x+4)(2x-5) (5x-4)(2-3x)-(3x-5)²

Home/ Toán Lớp 8: rút gọn : 3x(x-1)+(x+4)(2x-5) (5x-4)(2-3x)-(3x-5)²

Toán Lớp 8: rút gọn : 3x(x-1)+(x+4)(2x-5) (5x-4)(2-3x)-(3x-5)²

Tháng Sáu 5, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: rút gọn :
3x(x-1)+(x+4)(2x-5)
(5x-4)(2-3x)-(3x-5)²

Comments ( 2 )

  1. hienchaudiem
    hienchaudiem
    5 Tháng Sáu, 2022 at 3:50 chiều
    Reply
    .)3x(x-1)+(x+4)(2x-5)
    =3x^2-3x+2x^2-5x+8x-20
    =5x^2-20
    .)(5x-4)(2-3x)-(3x-5)^2
    =10x-15x^2-8+12x-[(3x)^2-2.3x.5+5^2]
    =10x-15x^2-8+12x-(9x^2-30x+25)
    =10x-15x^2-8+12x-9x^2+30x-25
    =-24x^2+52x-33

  2. thienthanh
    thienthanh
    5 Tháng Sáu, 2022 at 3:50 chiều
    Reply
    3x(x-1) + (x+4)(2x-5)
    =3x.x – 3x.1 + x.2x – x.5 + 4.2x – 4.5
    =3x² – 3x + 2x² – 5x + 8x – 20
    =5x²  – 20
    (5x-4)(2-3x) – (3x-5)²
    =5x . 2 -5x .3x – 4 .2 + 4.3x – ( 9x² – 30x + 25)
    =10x – 15x² – 8 + 12x – 9x² + 30x – 25
    =52x -24x²-33 

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

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