当x=5时,比较x2与2x的大小会怎样?当x等于多少时,x2和2x正好相当?x2会比2x小吗?举例说明?

当x=5时，x^2>2x
当x=0或2时，x^2=2x
当x=1 时，x^2

当x = 5,x² = 5² = 25
2x = 2(5) = 10
所以2x x² = 2x
x² - 2x = 0
x(x - 2) = 0
x = 0 或 x = 2
所以当x = 0或者x = 2时x² = 2x
x² x² - 2x x(x - 2) 0 所以当x的值在0至2之间时x² 例如x = 0.5,x = 1,x = 1.5等