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

Toán Lớp 7: thu gọn 3) x( x+ 1/5)- (2x-5) (1/2+4) 4) (x+2) (x^2-4x+1) – (x^3 -2x^2 +2) 5) (x-2) (2x^2 + x-1) -2x (x^2 -3/2x)

Toán Lớp 7: thu gọn
3) x( x+ 1/5)- (2x-5) (1/2+4)
4) (x+2) (x^2-4x+1) – (x^3 -2x^2 +2)
5) (x-2) (2x^2 + x-1) -2x (x^2 -3/2x)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    3) x( x+ 1/5)- (2x-5) (1/2+4)
    =x^2+1/5x-(2x-5)*9/2
    =x^2+1/5x-(18x-45/2)
    =x^2+1/5x-18x+45/2
    =x^2-89/5x+45/2
    4) (x+2) (x^2-4x+1) – (x^3 -2x^2 +2)
    =x^3-4x^2+x+2x^2-8x+2-(x^3-2x^2+2)
    =x^3-2x^2-7x+2-x^3+2x^2-2
    =-7x
    5) (x-2) (2x^2 + x-1) -2x (x^2 -3/2x)
    =2x^3+x^2-x-4x^2-2x+2-(2x^3-3x^2)
    =2x^3-3x^2-3x+2-2x^3+3x^2
    =-3x+2.

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