標題:
4條因式分解!!!!!!!!!!!!!!!!!!!!!!!!
發問:
6X^2 +18X = 0 15X=5X^2 X^2-49=0 25X^2-64=0
最佳解答:
6x^2+18x = 0 x^2+3x=0 x(x+3)=0 x=0 or x+3=0 x=0or x=-3 15x=5x^2 5x^2-15x=0 x^2-3x=0 x(x-3)=0 x=0 or x-3=0 x=0 or x=3 x^2-49=0 x^2-7^2=0 (x-7)(x+7)=0 x-7=0 or x+7=0 x=7 or x=-7 25x^2-64=0 (5x)^2-8^2=0 (5x-8)(5x+8)=0 5x-8=0 or 5x+8=0 x=8/5or x=-8/5
其他解答:
此文章來自奇摩知識+如有不便請留言告知
6X^2 +18X = 0 6(x^2+3x)=0 x^2+3x=0 x(x+3)=0 x=0 or x=-3 15X=5X^2 -5x^2+15x=0 5x^2-15x=0 5(x^2-3x)=0 x^2-3x=0 x(x-3)=0 x=0 or x=3 X^2-49=0 (x+7)(x-7)=0 x=7 or x=-7 25X^2-64=0 (5x+8)(5x-8)=0 x=-8/5 or x=8/5|||||6x^2+18x=0 6x(x+3)=0 x=0 or-3 15x=5x^2 0=5x^2-15x 5x^2-15x=0 5x(x-3)=0 x=0 or 3 x^2-49=0 x^2-7^2=0 (x+7)(x-7)=0 x=-7 or 7 25x^2-64=0 (5x)^2-8^2=0 (5x+8)(5x-8)=0 x=-8/5 or 8/5