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標題:

1至５題解下列各方程。６至１１題化簡下列各題。要做暑期作業．．．急呀．．．各位幫幫忙

發問:

1.5(4p+1)=-3 2.11(3-y)-8=14 3.8y=6(y+1) 4.2(x+1)=3(x-4) 5.4(p-1)=3(p+3)+2 6.(x+3)(x-2) 7.(2x-1)(x+5) 8.(5x+2)(3x-4) 9.(4x-7)(3x-5) 10.(x+3y)(3x-6y) 11.(2x+5)(2x-5)

最佳解答:

1. 5(4p+1)= -3 20p - 5 = -3 20p = 2 p = 1/10 2. 11(3-y)-8=14 33 - 11y - 8 = 14 -11y = -11 y = 1 3. 8y=6(y+1) 8y = 6y + 6 2y = 6 y = 3 4. 2(x+1)=3(x-4) 2x + 2 = 3x -12 x = 14 5. 4(p-1)=3(p+3)+2 4p - 4 = 3p + 9 + 2 p = 7 2008-08-06 21:35:59 補充： 6. (x+3)(x-2) =(x+2)(x-2) + (x-2) = x^2 -4 + x -2 = x^2 + x -6 7. (2x-1)(x+5) = 2x^2 + 10x -x -5 = 2x^2 + 9x -5 8. (5x +2) (3x -4) =15x^2 -20x +6x -8 = 15x^2 -14x -8 2008-08-06 21:36:04 補充： 9. (4x-7)(3x-5) =12x^2 -20x -21x +35 = 12x^2 -41x +35 10. (x+3y)(3x-6y) =3x^2 - 6xy + 9xy - 18y^2 = 3x^2 -18y^2 +3xy 11. (2x-5)(2x+5) =2x^2 -25

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