e. x+9/10 + x+10/9 = 9/x+10 + 10/x+9
Giải thích
x+910+x+109=9x+10+10x+9 (ĐKXĐ: x≠−9;x≠−10)
⇔x+910+1+x+109+1=9x+10+1+10x+9+1⇔x+1910+x+199=x+19x+10+x+19x+9⇔x+19.110+19−1x+10−1x+9=0⇔x+19=0110+19−1x+10−1x+9=0⇔x=−19 TMx=0 TMS=−19;0
x+910+x+109=9x+10+10x+9 (ĐKXĐ: x≠−9;x≠−10)
⇔x+910+1+x+109+1=9x+10+1+10x+9+1⇔x+1910+x+199=x+19x+10+x+19x+9⇔x+19.110+19−1x+10−1x+9=0⇔x+19=0110+19−1x+10−1x+9=0⇔x=−19 TMx=0 TMS=−19;0