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^)↗