9. 画出下列函数的图象,并写出函数的单调区间:(1)y=∣log2x−1∣y=\vert \log _{2}x-1\verty=∣log2x−1∣; (2)y=∣log2x∣+1y=\vert \log _{2}x\vert +1y=∣log2x∣+1.