解下列方程:(1)(x-2)(x+3)=6(2)(5x-2) 2 =3(5x-2
解下列方程:(1)(x-2)(x+3)=6(2)(5x-2)2=3(5x-2)...
解下列方程:(1)(x-2)(x+3)=6(2)(5x-2) 2 =3(5x-2)
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(1)(x-2)(x+3)=6, 整理得:x 2 +3x-2x-6=6,即x 2 +x-12=0, 分解因式得:(x-3)(x+4)=0, 可得x-3=0或x+4=0, 解得:x 1 =3,x 2 =-4; (2)(5x-2) 2 =3(5x-2), 移项得:(5x-2) 2 -3(5x-2)=0, 分解因式得:(5x-2)(5x-5)=0, 可得5x-2=0或5x-5=0, 解得:x 1 = ,x 2 =1. |
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