0.75+（-11/4）+0.125+（-5/7）+（-4又1/8）+0.25
=[0.75+（-11/4）]+0.125+（-5/7）+（-4又1/8）+0.25
=（0.75-2.75）+（0.125-4.125）+0.25-5/7
=-2-4+0.25-5/7
=-6+1/4-5/7
=-23/4-5/7
=-181/28
前面就是找小数点后相同的~最后才通分运算
↖(^ω^)↗