-41/84 .0有过程吗？第一题通分，然后就行了，-1/3+1/4-5/6+3/7= -28/84 +21/84 - 70/84 +36/84 =(-28+21-70+36)/84=-41/841/3-5/6+2/3-1/6= 1/3+2/3-(5/6+1/6)=1-1=0三克油！