5x(2x+3)=(2x+3)
问题描述：
5x(2x+3)=(2x+3)
(x+2)(x-1)=18
(x+3)^2=(2x-1)^2
(x=10)(600-10x)=10000
(x+2)^2+x^2=20
第四题应该是 （x+10)(600-10x)=10000
答
1.5x(2x+3)-(2x+3)=(5x-1)(2x+3)=0 x=-3/2,1/52.x^2+x-2-18=(x-4)(x+5)=0x=4,-53.(x+3)^2-(2x-1)^2=(x+3+2x-1)(x+3-2x+1)=(3x+2)(-x+4)=0 x=-2/3,44.600x-10x^2+6000-100x-10000=0 -10x^2+500x-4000=0 x^2...