f(x)=5x+3 f(x)=5x f(x)=x+2x+1 f(x)=5x+3 f(x)=5x f(x)=x+2x+1

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f(x)=5x+3f(x)=5xf(x)=x+2x+1f(x)=5x+3f(x)=5xf(x)=x+2x+1f(x)=5x+3f(x)=5xf(x)=x+2x+1f(x)=5x+3f(x)=5xf(x

f(x)=5x+3 f(x)=5x f(x)=x+2x+1 f(x)=5x+3 f(x)=5x f(x)=x+2x+1
f(x)=5x+3 f(x)=5x f(x)=x+2x+1
f(x)=5x+3 f(x)=5x f(x)=x+2x+1

f(x)=5x+3 f(x)=5x f(x)=x+2x+1 f(x)=5x+3 f(x)=5x f(x)=x+2x+1
这是直角坐标系下的三条曲线,5x和5x+3平行,x+2x+1与前两条直线分别有一个交点,交点坐标值也就是f(x)和x值,可以分别拿5x和5x+3与5x和5x+3联立方程组求出来.