.7×11分之3－6.6×7分之3－2.2÷3分之7＋0.7×11分之19
=0.7×11分之3－6.6×7分之3－2.2×7分之3＋0.7×11分之19
=0.7×（3/11+19/11）-（6.6+2.2）×3/7
=0.7×2-8.8×3/7
=1.4-3又27/35
=-2又13/35