1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/3 3.1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2

1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/3 3.1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2
1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/3 3.
1.2 1/2-3/4+3/7
2.3 5/12+1/4-2 2/3
3.3 3/4-3 3/5+4 1/12
4.12 1/3-26+1/15
5.8 3/10-21/5+1/2

1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/3 3.1.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2
  原式=42/4-3/4+3/7=39/4+3/7=273/28+12/28=285/28
  原式=35/12+3/12-88/12=-25/6
  原式=99/12+41/12-33/5=35/3-33/5=175/15-99/15=76/15
  原式=605/15+1/15-26=202/5-26=72/5
  原式=83/10-42/10+5/10=46/10