(5.4-4.5)=0.95.4+4.5=9.99.9/0.9=11 4.5-5.4=-0.9-0.9/9.9=-1/11
(5.4+4.5)(5.4-4.5)=10
(5.4 + 4.5) ÷ （5.4 - 4.5）= 9.9 ÷ 0.9 = 11就是这了，错了我就该去投胎了，o(∩_∩)o...呵呵
