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

Toán Lớp 8: làm tính nhân a) 5x^2.(3x^2 – 7x + 2) b) (2x^2-3x).(5x^2-5x +1) gấpp

Toán Lớp 8: làm tính nhân
a) 5x^2.(3x^2 – 7x + 2)
b) (2x^2-3x).(5x^2-5x +1)
gấpp

Comments ( 2 )

  1. a) =15x^4-35x^3+10x^2
    b) = 10x^4 – 10x^3 +2x^2 – 15x^3 + 15x^2 -3x
    = 13x^4 – 25x^3 + 17x^2 – 3x
     
    Lời giải và giải thích chi tiết:
     

  2. a)5x^2(3x^2-7x+2
    =5x^2 .3x^2+5x^2 .(-7x)+5x^2 .2
    =15x^4 -35x^3+10x^2
    b)(2x^2-3x)(5x^2-5x+1)
    =2x^2 .5x^2-2x^2 .5x+2x^2 .1-3x .5x^2+3x .5x-3x .1
    =10x^4-25x^3+17x^2-3x

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

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