用因式分解法解方程:2(x-1)²+X=1,(X+3)(X+1)=6X+6,2t(t+4)=t²-16
问题描述:
用因式分解法解方程:2(x-1)²+X=1,(X+3)(X+1)=6X+6,2t(t+4)=t²-16
答
用因式分解法解方程:
2(x-1)²+X=1,
2(x-1)²+(x-1)=0
(x-1)(2(x-1)+1)=0
(x-1)(2x-1)=0
x=1或x=1/2
(X+3)(X+1)=6X+6,
(X+3)(X+1)-6(X+1)=0
(X+1)(x-3)=0
x=-1或x=3
2t(t+4)=t²-16
2t(t+4)-(t+4)(t-4)=0
(t+4)(2t-t+4)=0
(t+4)(t+4)=0
t1,2=-4