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

Toán Lớp 8: $x(3x + 12) – (7x -20) – x²(2x + 3) + (2x² – 5)$ rút gọn nha

Tháng Mười 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: $x(3x + 12) – (7x -20) – x²(2x + 3) + (2x² – 5)$
rút gọn nha

Comments ( 2 )

  1. tonhu12
    tonhu12
    11 Tháng Mười, 2022 at 5:16 chiều
    Reply
    Giải đáp:
    $????(3????+12)−(7????−20)−1????²(2????+3)+(2????²−5)$
    $=3????²+12????−(7????−20)−1????²(2????+3)+(2????²−5)$
    $=3????²+12????−7????+20−1????²(2????+3)+(2????²−5)$
    $=3????²+12????−7????+20−(2????³+3????²)+(2????²−5)$
    $=3????²+12????−7????+20−2????³−3????²+(2????²−5)$
    $=3????²+12????−7????+20−2????³−3????²+2????²−5$
    $=3????²+12????−7????+15−2????³−3????²+2????²$
    $=3????²+5????+15−2????³−3????²+2????²$
    $=2????²+5????+15−2????³$
    $=−2????³+2????²+5????+15$
       Chúc bn hc tốt ???? 

  2. dantam45
    dantam45
    11 Tháng Mười, 2022 at 5:15 chiều
    Reply
    $x(3x+12)-(7x-20)- x^{2}(2x-3)+ (2x^{2}-5)$
    $=3x^{2}+12x-7x+20-2x^{3}-3x^{2}+2x^{2}-5$
    $=-2x^{3}+(3x^{2}-3x^{2}+2x^{2})+(12x-7x)+(20-5)$
    $=-2x^{3}+2x^{2}+5x+15$ 
     

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

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