1-4/7 3/4+1 1/2+1/3+1/4

1+4/7 3/4+1/8 1/3-1/6-1/12

) 1-4/7 =7/7-4/7=3/7 2.) 3/4+1 =1×(3/4) 3.) 1/2+1/3+1/4=6/12+4/12+3/12=13/12=1(1/12) 4.)1+4/7=1(4/7) 5.)3/4+1/8=6/8+1/8=7/8 6.) 1/3-1/6-1/12=4/12-2/12-1/12=1/12