方程2X(X-3)=5(X-3)的根是方程(2X-1)(X-3)=4怎样解,
问题描述:
方程2X(X-3)=5(X-3)的根是
方程(2X-1)(X-3)=4怎样解,
答
2X(X-3)=5(X-3)
2x²-6x=5x-15
2x²-11x+15=0
(2x-5)(x-3)=0
x1=2.5
x2=3
(2X-1)(X-3)=4
2x²-7x+3=4
2x²-7x-1=0
求根公式了
x=7±根号57/4